Sierra 18-21751 Engine Coupler for OMC, VolvoSierra replacement engine coupler for OMC and Volvo Penta engines. All Sierra engine parts are manufactured to meet or exceed OEM requirements.Fits: OMC 2.5L (1986), 3.0L (1986-90), 4.3L/5.0L/5.7L (1986) KW & KWB Suffix only.; OMC 7.4L (1990-98), 8.2L (1992-93, 1998); Interchangeable With: Volvo; 3853962; OMC Stern Drive; 3853962; 986338; 983902;