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The Ball Gear Kit from Sierra is compatible with 1973-86 OMC Sterndrives. It includes (1) O-Ring, (2) Plugs, (2) Ball Gears, (2) Locknuts, (1) O-Ring and (4) Oil Seals.
Engine coupler model 21751 is an OMC Sterndrive/Cobra engine coupler. It is a replacement for OEM part # Volvo Penta 3853962-3 and fits Volvo-Penta 2.5L, 3.0L, 4.3L, 5.0L, 5.7L KW & KWB suffix only, 7.4L and 8.2L.
Model 21752-1 is an OMC Sterndrive/Cobra engine coupler that replaces parts 3858437, 984290, 986120 and 3853917. It fits Volvo-Penta 4.3L, 5L and 5.7L.
Engine Coupler Model 2178 fits Volvo-Penta 5.0L & 5.8L and is a replacement for OEM parts 985727 and 3853862-5.