Sierra International 18-21751 Engine Coupler 18-21751. 5L (1986) 3.0L (1986-1990) 4.3L/5.0L/5.7L (1986 KW and KWB suffix only) 7.4L (1990-1998) 8.2L (1992-1993 1998). It is interchangeable with OMC Stern Drive 3853962 983902 986338 Volvo Penta 3853962....