MR GASKET WATER PUMP PULLEY SHIM KIT, SET OF 3 -- Fits Ford and GM with 3/4 in. or 5/8 in. center shaft; Designed to properly align the pulleys so the belts will stay put; Made from aluminum sheet stock; Installed between the water pump and water pump pulley; Contains two 1/16 in. and one 1/8 in. shim; With Mr. Gasket's limited 90-day warranty.