Description: All engines. Without supercharger. With supercharger, alt, p/s & ac. Riviera. Ac, alt & p/s, water pump. All models. 3.8l. Allows for the operation of various pulleys, and drive belt accessories, with the use of a single belt Creates a secure point of contact with the pulley, which allows for traction Original equipment parts are designed to work with your GM vehicle safety systems -- aftermarket replacement parts may not meet the same OE safety regulations, depending on the part type