Our 1955-57 Pontiac Fullsize car, front disc brake conversion kit uses Lg. GM calipers for more friction surface area and improved stopping power. Our kit comes standard with GM 5 X 4.75" bolt pattern 11" rotors, factory bolt pattern is 5X5. This kit requires new front rims to complete the conversion. Kit mounts to your original spindle making installation a snap. Works with 14" disc brake type wheels

Specs:

11" Rotor, 5x4.75" Bolt Pattern