SEI New SEI / Mercruiser Alpha 1 & Alpha 1 Gen II Shift Cable Kit – Fits 1972–Present R, MR, Alpha 1 & Gen II Drives – Replaces OEM #19543A4 MSRP: Was: Now: $48.95 Choose Options
SEI New SEI / Mercruiser Alpha I Hose & Hardware Kit (1972–1992) – For 15-9/16" Trim Cylinders – Includes Hoses & Mounting Hardware MSRP: Was: Now: $170.00 Add to Cart
SEI New SEI / Mercruiser Alpha 1 Hose & Hardware Kit (1972–1992) – For External Line Trim Cylinders – Includes Hoses & Mounting Hardware – Replaces SEI 9B-102 MSRP: Was: Now: $170.00 Add to Cart
SEI New SEI / Mercruiser Alpha 1 16-3/16" Trim Cylinder (Port or Starboard) – Fits 1972–1991 Alpha One Drives – Replaces OEM #14034A3 / 14035A3 MSRP: Was: Now: $169.95 Choose Options
SEI New SEI / Mercruiser Alpha 1 Trim Cylinder – 15-9/16" Long – Replaces OEM #98703A3 / 98703A4 MSRP: Was: Now: $165.00 Choose Options
SEI New SEI / Mercruiser Alpha 1 External Line Trim Cylinder (1972–1991) – Fits Port or Starboard – Replaces OEM #32-87234 MSRP: Was: Now: $160.00 Choose Options
SEI New SEI / Yamaha 1990-2009 V6 3.1/3.3L 76° Counter-Rotation Gearcase MSRP: Was: Now: $1,645.00 Choose Options
SEI New SEI / Mercruiser Alpha I (1972–1990) Lower Housing Seal Kit – Replaces OEM #26-33144A2 MSRP: Was: Now: $57.71 Choose Options
SEI New SEI / MerCruiser Alpha One Upper Seal Kit (1972–1990) – Replaces OEM 26-32511A1 MSRP: Was: Now: $35.85 Choose Options
SEI New SEI / MerCruiser Alpha One Counter-Rotation Bearing Carrier (1972–1990) – Replaces OEM 14587A5 MSRP: Was: Now: $156.30 Choose Options
SEI New SEI / MerCruiser Alpha One Bearing Carrier (1972–1990) – Replaces OEM 818763A11 / 43567T1 MSRP: Was: Now: $84.74 Choose Options
SEI New SEI / MerCruiser Alpha One Lower Gear Set (1972–1990) – 1.62:1 Ratio – Counter Rotation – Replaces OEM 812975A5 / 824700A1 MSRP: Was: Now: $550.95 Choose Options
SEI New SEI / MerCruiser Alpha One & Alpha One Gen II Lower Gear Set (1972–1997) – 1.62:1 Ratio – 3.265" O.D. Case – Replaces OEM 828072A3 / 828073A1 / 43-878087A4 MSRP: Was: Now: $399.95 Choose Options
SEI New SEI / MerCruiser Alpha One & Alpha One Gen II Lower Gear Set (1972–1997) – 1.62:1 Ratio – 3.500" O.D. Case – Replaces OEM 43-878087A4 / 43-828073A1 MSRP: Was: Now: $399.95 Choose Options
SEI New SEI / MerCruiser Alpha One Upper Gear Set (1972–1990) – 5.7L V8 – 1.47 / 1.50 Ratio – Replaces OEM 43-18410A4 MSRP: Was: Now: $314.99 Choose Options
SEI New SEI / Mercruiser Alpha 1 5.0L V8 Heavy Duty Upper Gear Set (1972–1990) – 1.62/1.65:1 Ratio – SEI Designed – Fits I, R, MR, Alpha I Drives MSRP: Was: Now: $314.99 Choose Options
SEI New SEI / Mercruiser Alpha 1 5.0L V8 Upper Gear Set (1972–1990) – 1.62:1 Ratio – Replaces OEM #43-45814A5 MSRP: Was: Now: $275.70 Choose Options
SEI New SEI / MerCruiser Alpha One Upper Gear Set (1972–1990) – 4.3L V6 – 1.81 Ratio – Replaces OEM 43-75325A3 MSRP: Was: Now: $218.98 Choose Options
SEI New SEI / MerCruiser Alpha One Upper Gear Set (1972–1990) – 3.0L 4-Cylinder – 1.94 / 2.40 Ratio – Replaces OEM 43-55778A3 MSRP: Was: Now: $206.95 Choose Options
SEI New SEI / Mercruiser Alpha 1 & Alpha 1 Gen II Lower Unit Clutch Dog (1973–Present) – Replaces OEM #52-853594T & 52-853594 MSRP: Was: Now: $112.03 Choose Options
SEI New SEI / Mercruiser 1972-1990 Alpha 1 Upper Sterndrive Assembly (9 9/16" Input Yoke) # 90-106-01A MSRP: Was: Now: $965.00 Choose Options
SEI New SEI / Mercruiser 1972-1990 Alpha 1 Upper Sterndrive Assembly (8 1/8" Short Yoke) MSRP: Was: Now: $965.00 Choose Options
SEI New SEI / Mercruiser 1972-1990 Alpha 1 4 CYL, V6 and V8 Counter-Rotation Gearcase MSRP: Was: Now: $1,175.00 Choose Options
SEI New SEI / Mercruiser Alpha 1 1972-1990 4 CYL, V6 & V8 Sterndrive Gearcase MSRP: Was: Now: $1,065.99 Choose Options
SEI New SEI / MerCruiser MR & Alpha One Driveshaft (1982–1990) – Fits Serial #0D469858 & Below – Replaces OEM 45-42634 MSRP: Was: Now: $297.35 Choose Options
SEI New SEI / MerCruiser Alpha One Counter-Rotation Propshaft (1972–1990) – Replaces OEM 814606-1 MSRP: Was: Now: $305.95 Choose Options
SEI New SEI / MerCruiser Alpha One & Alpha One Gen II Ratcheting Shift Spool (1972–Present) – Fits I, R, MR, Alpha I & Gen II Drives – Replaces OEM 818349T1 MSRP: Was: Now: $55.99 Choose Options
SEI New SEI / MerCruiser Alpha One Shift Shaft (1973–1990) – Fits I, R, MR, and Alpha I Drives – Replaces OEM 77481-1 MSRP: Was: Now: $29.95 Choose Options
SEI New SEI / MerCruiser Alpha One Complete U-Joint Assembly with Short Yoke (1972–1982) – Fits Inline 4 & Inline 6 Engines – Replaces OEM 58858A1 MSRP: Was: Now: $305.95 Choose Options
SEI New SEI / MerCruiser Alpha One & Alpha One Gen II Complete U-Joint Assembly (1972–Present) – Replaces OEM 814819A2 – Fits 9-9/16" Engine End Yoke MSRP: Was: Now: $299.95 Choose Options
SEI New SEI / Mercruiser Alpha 1 & Alpha 1 Gen II Shift Cable Kit – Fits 1972–Present R, MR, Alpha 1 & Gen II Drives – Replaces OEM #19543A4 This SEI Marine Shift Cable Kit is designed for Mercruiser Alpha 1 and Alpha 1 Gen II sterndrives (1972–Present), including R and MR models. It directly replaces OEM part numbers 19543A4 and... MSRP: Was: Now: $48.95 Choose Options
SEI New SEI / Mercruiser Alpha I Hose & Hardware Kit (1972–1992) – For 15-9/16" Trim Cylinders – Includes Hoses & Mounting Hardware This SEI Marine Hose & Hardware Kit is designed for Mercruiser Alpha I sterndrives (1972–1992) equipped with 15-9/16" trim cylinders. It includes both hydraulic trim hoses and all necessary... MSRP: Was: Now: $170.00 Add to Cart
SEI New SEI / Mercruiser Alpha 1 Hose & Hardware Kit (1972–1992) – For External Line Trim Cylinders – Includes Hoses & Mounting Hardware – Replaces SEI 9B-102 This SEI Marine Hose & Hardware Kit is designed for Mercruiser Alpha 1 sterndrives (1972–1992) equipped with external line trim cylinders. The kit includes all necessary hydraulic hoses and... MSRP: Was: Now: $170.00 Add to Cart
SEI New SEI / Mercruiser Alpha 1 16-3/16" Trim Cylinder (Port or Starboard) – Fits 1972–1991 Alpha One Drives – Replaces OEM #14034A3 / 14035A3 This SEI Marine Trim Cylinder is a direct replacement for Mercruiser Alpha One sterndrives manufactured from 1972–1991. Designed for 16-3/16" cylinder applications, this unit replaces both port... MSRP: Was: Now: $169.95 Choose Options
SEI New SEI / Mercruiser Alpha 1 Trim Cylinder – 15-9/16" Long – Replaces OEM #98703A3 / 98703A4 This SEI Marine Trim Cylinder is designed for Mercruiser Alpha 1 sterndrives (1972–1991) using the 15-9/16" long trim cylinder. It can be used on either the port or starboard side, replacing... MSRP: Was: Now: $165.00 Choose Options
SEI New SEI / Mercruiser Alpha 1 External Line Trim Cylinder (1972–1991) – Fits Port or Starboard – Replaces OEM #32-87234 This SEI Marine External Line Trim Cylinder is a direct replacement for Mercruiser Alpha 1 sterndrives (1972–1991). Designed to fit either port or starboard, it replaces OEM part numbers... MSRP: Was: Now: $160.00 Choose Options
SEI New SEI / Yamaha 1990-2009 V6 3.1/3.3L 76° Counter-Rotation Gearcase This listing is for a New SEI Yamaha V6 3.1/3.3L 76° Counter Rotation Lower Unit. This unit includes a water pump and driveshaft. Please confirm the driveshaft length you need when placing your... MSRP: Was: Now: $1,645.00 Choose Options
SEI New SEI / Mercruiser Alpha I (1972–1990) Lower Housing Seal Kit – Replaces OEM #26-33144A2 This SEI Marine Lower Housing Seal Kit is a direct replacement for Mercruiser Alpha I sterndrives (1972–1990). The kit includes all essential seals and O-rings required for servicing or... MSRP: Was: Now: $57.71 Choose Options
SEI New SEI / MerCruiser Alpha One Upper Seal Kit (1972–1990) – Replaces OEM 26-32511A1 This SEI Marine Upper Seal Kit is a direct-fit replacement for MerCruiser Alpha One (Gen I) sterndrives manufactured between 1972 and 1990. It replaces OEM 26-32511A1 and includes all necessary seals... MSRP: Was: Now: $35.85 Choose Options
SEI New SEI / MerCruiser Alpha One Counter-Rotation Bearing Carrier (1972–1990) – Replaces OEM 14587A5 This SEI Marine Counter-Rotation Bearing Carrier is designed as a direct replacement for MerCruiser Alpha One sterndrives manufactured between 1972 and 1990. It replaces OEM 14587A5, providing... MSRP: Was: Now: $156.30 Choose Options
SEI New SEI / MerCruiser Alpha One Bearing Carrier (1972–1990) – Replaces OEM 818763A11 / 43567T1 This SEI Marine Bearing Carrier is a direct replacement for MerCruiser Alpha One sterndrives manufactured from 1972 to 1990. It replaces OEM 818763A11 and 43567T1, offering precision fit, alignment,... MSRP: Was: Now: $84.74 Choose Options
SEI New SEI / MerCruiser Alpha One Lower Gear Set (1972–1990) – 1.62:1 Ratio – Counter Rotation – Replaces OEM 812975A5 / 824700A1 This SEI Marine Counter-Rotation Lower Gear Set is a precision-engineered replacement for MerCruiser Alpha One sterndrives manufactured from 1972 to 1990. Featuring a 1.62:1 gear ratio, this set... MSRP: Was: Now: $550.95 Choose Options
SEI New SEI / MerCruiser Alpha One & Alpha One Gen II Lower Gear Set (1972–1997) – 1.62:1 Ratio – 3.265" O.D. Case – Replaces OEM 828072A3 / 828073A1 / 43-878087A4 This SEI Marine Lower Gear Set is a precision-built replacement for MerCruiser Alpha One and Alpha One Gen II sterndrives with serial numbers 0F680000 and up. Featuring a 1.62:1 gear ratio and 3.265"... MSRP: Was: Now: $399.95 Choose Options
SEI New SEI / MerCruiser Alpha One & Alpha One Gen II Lower Gear Set (1972–1997) – 1.62:1 Ratio – 3.500" O.D. Case – Replaces OEM 43-878087A4 / 43-828073A1 This SEI Marine Lower Gear Set is designed for MerCruiser Alpha One and Alpha One Gen II sterndrives with serial numbers 0F679999 and below. Featuring a 1.62:1 gear ratio and a 3.500" O.D. forward... MSRP: Was: Now: $399.95 Choose Options
SEI New SEI / MerCruiser Alpha One Upper Gear Set (1972–1990) – 5.7L V8 – 1.47 / 1.50 Ratio – Replaces OEM 43-18410A4 This SEI Marine Upper Gear Set is engineered as a direct replacement for MerCruiser Type I, R, MR, and Alpha One sterndrives from 1972–1990, designed specifically for 5.7L V8 engines. Featuring... MSRP: Was: Now: $314.99 Choose Options
SEI New SEI / Mercruiser Alpha 1 5.0L V8 Heavy Duty Upper Gear Set (1972–1990) – 1.62/1.65:1 Ratio – SEI Designed – Fits I, R, MR, Alpha I Drives This SEI Marine Heavy Duty Upper Gear Set is designed and manufactured by SEI specifically for Mercruiser 5.0L V8 sterndrives with 1.62:1 or 1.65:1 gear ratios. It fits Type I, R, MR, and Alpha I... MSRP: Was: Now: $314.99 Choose Options
SEI New SEI / Mercruiser Alpha 1 5.0L V8 Upper Gear Set (1972–1990) – 1.62:1 Ratio – Replaces OEM #43-45814A5 This SEI Marine Upper Gear Set is a direct replacement for Mercruiser 5.0L V8 sterndrives featuring a 1.62:1 gear ratio. It fits Type I, R, MR, and Alpha I drives from 1973 through 1990, including... MSRP: Was: Now: $275.70 Choose Options
SEI New SEI / MerCruiser Alpha One Upper Gear Set (1972–1990) – 4.3L V6 – 1.81 Ratio – Replaces OEM 43-75325A3 This SEI Marine Upper Gear Set is a direct replacement for MerCruiser Type I, R, MR, and Alpha One sterndrives from 1972 to 1990, designed for 4.3L V6 engines. Featuring a 1.81 gear ratio, this set... MSRP: Was: Now: $218.98 Choose Options
SEI New SEI / MerCruiser Alpha One Upper Gear Set (1972–1990) – 3.0L 4-Cylinder – 1.94 / 2.40 Ratio – Replaces OEM 43-55778A3 This SEI Marine Upper Gear Set is a precision-engineered replacement for MerCruiser Type I, R, MR, and Alpha One sterndrives used with 3.0L 4-cylinder engines (1972–1990). Featuring a 1.94 / 2... MSRP: Was: Now: $206.95 Choose Options
SEI New SEI / Mercruiser Alpha 1 & Alpha 1 Gen II Lower Unit Clutch Dog (1973–Present) – Replaces OEM #52-853594T & 52-853594 This SEI Marine Lower Unit Clutch Dog is a direct replacement for Mercruiser I, R, MR, Alpha I, and Alpha I Gen II sterndrives from 1973 to present. Manufactured to precise OEM standards, it ensures... MSRP: Was: Now: $112.03 Choose Options
SEI New SEI / Mercruiser 1972-1990 Alpha 1 Upper Sterndrive Assembly (9 9/16" Input Yoke) # 90-106-01A This listingis for a SEI / Mercruiser Alpha 1 1972-1990 Upper Unit With 9 9/16th New Style Input Yoke. Replaces OEM Number 9412A23, 9412A20, 9412A21, 9412A22. Replaces R, MR, Alpha... MSRP: Was: Now: $965.00 Choose Options
SEI New SEI / Mercruiser 1972-1990 Alpha 1 Upper Sterndrive Assembly (8 1/8" Short Yoke) SEI Mercruiser Alpha 1 1972-1990 Upper Unit With 8 1/8" Short Yoke. Replaces OEM Number 5523A65, 5523A67, 5523A66. Replaces R, MR, Alpha One lowers from 1972-1990, 13 Spline Driveshaft,... MSRP: Was: Now: $965.00 Choose Options
SEI New SEI / Mercruiser 1972-1990 Alpha 1 4 CYL, V6 and V8 Counter-Rotation Gearcase New SEI Mercruiser Alpha 1 1972-1990 Counter Rotation Lower Unit. Replaces OEM Number 8951A43. Will fit 4 cylinder, V6 and V8 engines. Will not work for Alpha 1 GEN II drives. Replaces R, MR, Alpha... MSRP: Was: Now: $1,175.00 Choose Options
SEI New SEI / Mercruiser Alpha 1 1972-1990 4 CYL, V6 & V8 Sterndrive Gearcase New SEI Mercruiser Alpha 1 1972-1990 Lower Unit. Replaces OEM Number 8951A43. Will fit 4 cylinder, V6 and V8 engines. Will not work for Alpha 1 GEN II drives. Replaces R, MR, Alpha One lowers from... MSRP: Was: Now: $1,065.99 Choose Options
SEI New SEI / MerCruiser MR & Alpha One Driveshaft (1982–1990) – Fits Serial #0D469858 & Below – Replaces OEM 45-42634 This SEI Marine Driveshaft is a precision-engineered replacement for MerCruiser MR and Alpha One sterndrives manufactured between 1982 and 1990 (serial numbers 0D469858 and below). Built to OEM... MSRP: Was: Now: $297.35 Choose Options
SEI New SEI / MerCruiser Alpha One Counter-Rotation Propshaft (1972–1990) – Replaces OEM 814606-1 This SEI Marine Counter-Rotation Propshaft is a precision-engineered replacement for MerCruiser Alpha One sterndrives manufactured between 1972 and 1990. Built to OEM specifications, this propshaft... MSRP: Was: Now: $305.95 Choose Options
SEI New SEI / MerCruiser Alpha One & Alpha One Gen II Ratcheting Shift Spool (1972–Present) – Fits I, R, MR, Alpha I & Gen II Drives – Replaces OEM 818349T1 This SEI Marine Ratcheting Shift Spool is a direct replacement for MerCruiser I, R, MR, Alpha One, and Alpha One Gen II sterndrives manufactured from 1972 to present. Engineered to precise OEM... MSRP: Was: Now: $55.99 Choose Options
SEI New SEI / MerCruiser Alpha One Shift Shaft (1973–1990) – Fits I, R, MR, and Alpha I Drives – Replaces OEM 77481-1 This SEI Marine Shift Shaft is a precision-built replacement for MerCruiser I, R, MR, and Alpha One sterndrives manufactured between 1973 and 1990. Designed to OEM specifications, this component... MSRP: Was: Now: $29.95 Choose Options
SEI New SEI / MerCruiser Alpha One Complete U-Joint Assembly with Short Yoke (1972–1982) – Fits Inline 4 & Inline 6 Engines – Replaces OEM 58858A1 This SEI Marine Complete U-Joint Assembly with Short Yoke is designed for MerCruiser I, R, MR, and Alpha One sterndrives manufactured between 1972 and 1982. It fits applications using the 8-1/8"... MSRP: Was: Now: $305.95 Choose Options
SEI New SEI / MerCruiser Alpha One & Alpha One Gen II Complete U-Joint Assembly (1972–Present) – Replaces OEM 814819A2 – Fits 9-9/16" Engine End Yoke This SEI Marine Complete U-Joint Assembly is a direct replacement for MerCruiser I, R, MR, Alpha One, and Alpha One Gen II sterndrives manufactured from 1972 to present. Designed for drives using the... MSRP: Was: Now: $299.95 Choose Options
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