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 One lowers from 1972-1990. 13 Spline Driveshaft. Up to 300 HP. Three year fault free warranty (click HERE for details).