Mercruiser Quicksilver OEM #18643A5

Mercury Marine 18643A5 Coupling Assembly. Fits Mercury Marine MCM 3.0L (1999 & Newer), 4.5L MPI, GM V-6 & V-8 (305 & 350 cid) engines (1993 & Newer) with Alpha sterndrives with 14" flywheel, 3" crankshaft bolt pattern, 1-piece rear main seal. Features: NO YOKE Includes mounting bolts, rubber bumpers and washers Note if replacing original coupler with original input yoke, order 18-2175 to update to the 18643A7 combination