I know that there are others that know better than I, but IIRC it depends on the year or Cougar it came out of. Some of the early ones require no modifications. On the later ones IIRC, the speed sensor was moved and a jumper loom is needed to reach the new position.
I'm pretty sure that Bill Jenkins knows if you can't find what you need here. Check with him at Team Ford in Las Vegas. Terry Haines would also know. He has a shop in southwestern Michigan.
Like I said, there are others that know the details better than I, and hopefully one of them will respond.