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Mercury Marine 18643A5 Engine Coupler Triangular shaped flywheel mount engine coupler kit 18643A5 is for 3.0L (model year 1999 through 2016), 4.5L MPI, V-6 and V-8 MerCruiser engines made by General Motors (305 and 350 cid) (model year 1993 through 2015) with MerCruiser Alpha stern drives. See your service or parts manual for specific applications.The Quicksilver brand is the leader in delivering …