1963 1964 Thunderbird Disc Brake Conversion Front and Rear Power Booster Kit. 11" Rotors, loaded calipers, mounting brackets and all necessary hardware. Includes 8" Dual brake booster Combo. One part number buys it all! Front & Rear kits with booster combo with dual line master for disc and disc, this is a simple bolt-on front disc brake kit that uses OEM spindles. No alignment required does not alter your vehicles ride height, and can be used with 14" wheels.