The ARP water pump pulley stud kit includes black 5/16-24 hex studs 4.000 inches long with a 2.750 inch fan spacer, supplied as a stud kit for water pump pulley mounting. The description provides thread size, stud length and spacer dimension so you can confirm compatibility with your pulley and fan setup before ordering the kit.
ARP 5/16-24 X 4.000 Black Hex Water Pump Pulley w/ 2.750in Fan Spacer Stud Kit