Carburetor idle mixture screw caps like originally came on the cars from the factory. Exact reproduction of Ford part number C7AZ-9J500-A. This clip onto the idle mixture screws of any 1967-73 Autolite or Motor Craft carburetor 2100 or 4300. They also will fit the 429 Cobra Jet with Ford numbered Rochester Quadrajet carburetors in 1970-71. Sold as a PAIR.