Drive Serial Number Range 2763442 - 6854392 Models which have been retro fitted with an Alpha style ( no preload pin on top of driveshaft) must use Part# 18-3420
Interchangeable with:
California Residents: 
WARNING
Cancer and Reproductive Harm -
P65Warnings.ca.gov
Sierra 18-3420 Mercruiser Alpha 1 Water Pump Base Sierra high-quality engine parts are designed to meet OEM specifications. This Water Pump Base fits MR & Alpha One Drives (1985-1990)...
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Seal Ring Gasket (Priced Per Pkg of 2) - Special Order est. 10 Days
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Mercury - Mercruiser 8M0176524 Shift Cable Assembly Genuine OEM Mercury-Mercruiser part. Replacement Mercruiser shift cable assembly. Fits: MC‑I, R, MR, Alpha One & Gen II (1978 &...
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Lewmar 140TT Bow Thruster Anode Kit Spade anodes used in conjunction with Lewmar Bow Thruster fitted with a bronze hub.
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Sierra 18-7630 Throttle Position Sensor Sierra replacement throttle position sensor for Mercruiser Stern Drives. Fits MCM/MIE GM V-6 & V-8 (305, 350, 454 & 502 CID) EFI engines...
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