These Fit and Work with 2300, 4150, 4160 & 4500 Series Holley Carburetors With Center Hung Floats. Carburetor Float Hanger Hardware Kit For Center Hung Floats - Fits: Holley. Includes (x2) Float Hanger, (x2) Float Bumper Spring, (x2) Float Pin & (x4) Float Bracket Screw.