All new parts for rebuilding the right and left shutoff butterfly in the air conditioning register vents. Fits all 1967-68 Mercury Cougar and Ford Mustang with factory A/C. Kit includes 2 knobs, 2 black butterfly vent doors, 2 shafts, and 2 retainers. All of these individual parts are also separately. Chrome vent registers and vent retainers are also available.