1955 1956 1957 Thunderbird Complete Front, Rear & Power Booster Kit. Complete Front and Rear kits, 11" Rotors, loaded calipers, mounting brackets and all necessary hardware. Rear is for a 9" Big Bearing axle. Includes 8" Dual power brake booster combo w/ mounting brackets that bolts to the firewall and clears the hood hatch. This is our best selling front disc kit and does not offset the wheels and fits most 14" wheels.