Used FMX transmission tail shaft or housing extension as Ford called them in the Master Parts Catalog. Fits all 1969-73 Mercury Cougar and Ford Mustang cars with transmission code X on the door tag. Cast aluminum construction. C9ZP-7A040-A version also available for slightly more money. Exact same part, just got updated for some engineering or manufacturing reason.
The overall length of this housing is 12 7/8", which was also used on 1969 Fairlanes and Torinos. This housing will not fit full sized Ford Mercury cars that have an FMX, as the full sized cars used a slightly longer tail housing that is 16 1/2" long.
Replaces Ford part number D2ZP-7A040-A.