Used extension or rod for the vacuum actuator for controlling the fresh air door on the 1969-73 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 6 inches long. For 1969-73 Cougar and Mustang, has a dog leg jog as shown. On the right hand end, of the A/C plenum. Vacuum actuator sold separately, see related items.
Stamped with Ford casting number C9ZA-18A318-F or C9ZA-18A318-K. The Ford MPC lists this under vacuum assembly C9ZZ-18A318-C.