Fits 1999-2001 MCM V6 & V8 (305 & 350 cid) Alpha engines with high mounted alternator (serial No. 0L619000-0M320024) Replacement belt matches original as installed by MerCruiser Replace worn or damaged belts to maintain proper function of engine systems driven by the belt See your owner's manual or service manual for specific applications and installation instructions Produced to meet Mercury Marine original equipment manufacturer specifications to maximize the performance of your Mercury and Mariner outboard or MerCruiser sterndrive