This set consists of 6 allen head plugs to fit the AIR ports (air rail) in the cylinder head, 2 allen plugs to fit in place of 1 or 2 of the BVSVs in the t-stat housing, and 2 hi-temp vinyl caps to fit the 1 or 2 AIR hose connections on the air cleaner. Fits many different years of F/2F engines.