Holley Carburetor Throttle Lever Studs # HO20-2 Throttle Lever Studs, 1/4 in., 5/16 in., 7/32 in., 3/8 in., Universal, Kit Quantity:Sold as a kit. Notes:Kit includes one 1/4 in., one 5/16 in., one 7/32 in., and one 3/8 in. throttle stud adapters. Replace your worn or missing throttle studs with the Holley recommended carburetor throttle lever studs.