Mercury Mercruiser Serpentine BeltQuicksilver 2667 mm Serpentine Belt fits MerCruiser sterndrive and inboard engines. It is the same belt as installed by MerCruiser.Replaces: Merc - 57-863876-6Pro Marine - 18-15102; Sierra - 18-15102; Product Features Matches the original belt installed by MerCruiser; Replaces old or damaged belts to maintain proper operation function of engine system driven by the belt; Designed to meet Mercury Marine original equipment manufacturer specifications to maximize the performance of your Mercury and Mariner outboard or MerCruiser sterndrive;