This stock kit includes a 9" single diaphragm booster with dual master cylinder and proportioning valve, rotors, and calipers; hoses and disc brake brackets; OM brake lines; and bearings and hardware. The front and rear rotors are 11" The front calipers are 2-1/2" and the rears are 2-1/8" The offset is 1.063" The minimum wheel size for the front is 14" and the rear is 15" The backspacing is factory