Pirate Mfg 1/2" Open Square Phenolic Carburetor Spacer Fits Edelbrock Holley SBC BBC Chevy This is For A BRAND NEW 1/2" Phenolic Plastic Carb Spacer And Stud Kit For 4150 Series Carbs Fits Holley, Edelbrock, Barry Grant (Demon), Chevy, Ford, Mopar and any other square bore carburetor Kit Contains (as pictured): (1) 1/2" Phenolic Plastic Spacer, (2) Gaskets, (4) Bolts, (4) Washers, (4) Nuts