See more: Carburetor Parts
53, S&S, Description: Insulator Block with O-ring, 1 7/8" x 1/4" Super E, S&S: 16-0491
Parts fit Super E carburetors with 1 7/8" (47.625mm) throat and Super G carburetors with 2 1/16" (52.4mm) throat, unless otherwise indicated.