Sierra International 18-2323 Engine Coupler 18-2323. It is designed for use with Mercruiser 3.0L (1999 & Up) 4.5L MPI GM V6 and V8 (305 & 350 CID) engines (1993 & Up) with Alpha. It is interchangeable with Mallory 9-72507 and Mercruiser Stern Drive...