Used extension or rod for the vacuum actuator for controlling the Heat / Defrost door on the 1971-73 Mercury Cougar or Ford Mustang factory integral A/C boxes. This gets screwed onto the tab on the vacuum actuator, which make the unique part numbers from the Ford MPC. About 1-3/8 inches long. For 1971-73 Cougar and Mustang. On the passenger side of the blower housing assembly. Vacuum actuator sold separately, see related items.
Stamped with Ford casting number D1ZA-18A318-B1B.