New GM cover stud. This listing is for 1 single stud that mount the supercharge plastic engine cover to the engine. There are 3 different sizes, 4 studs in total required to mount the cover. This is the shortest of the 4, which sits on the front of the supercharger, above the belt. This has a 8mm round ball and is 16mm tall (measured from the bolt flange to the top). This is for the factory LS9 Corvette superchargers, the studs for the LSA chargers are different, and listed in a different listing. For a complete set of LS9 studs, view listing #