help with 5 lug conversion and more

Insifficent data to complete post as requested.

Im assuming the late model Cougar 5 lug rear is a Fox body rear like out of a XR7 turbo which IIRC is same as Turbo coupe rear.

The main problem is we dont know the offset of the rims in question.
 
Im a bit confused as well. If the rear was like a TC rear it would be 4lug. Didnt know any cougers came with 5 lug and disc brake. For the front, I imagine the easiest thing to do would be to use spindles off one of the 5.0 stangs and run the lincoln rotors and 73mm calipers as well. Dont know if the dustcaps will clear those wheels or not though.

edit: I just saw that the rims you want are 10.5 in the rear. I would be aware that you will almost certainly have clearance issues there on a fox body. And if your rear is the same width sa an XR7 ot TC, it is 1.5" wider than a mustang rear and will reall give you some serious issues with those rims.
 
There was one more generation of Cougars after the Fox years that still had the solid rear axle. It was the last generation that followed the T-Bird line. The little Cougars that followed that were IRS if I remember right.