GM LS Gen III/IV Series Water Pump Pulley -GM LS Gen III/IV, Firebird, Camaro, GM Sport Trucks, SUV, and Utility Vans for 4 hole aftermarket hub. Billet Aluminum, 83mm Deep, Black Anodized. PRWs Water Pump Pulleys are Anodized to minimize tarnishing and are CNC machined from 6061 T-6 Billet Aluminum. They can also be applied to Edelbrock Pump PN 8896 and Cartridge PN 8897.