The product is an original GM crankshaft pulley for a 1962-1980 Chevrolet Corvette. This vintage part is specifically designed for those models and is not a universal fitment. It bears the OE/OEM part number 3858533BJ and is a genuine General Motors product. Made for the Corvette, this crank pulley is a true OEM replacement part that is essential for maintaining the correct performance and functionality of the vehicle.