Tim the rearend in your NAF was most likely from a late 80's Ford ie Granada/Monarch or such, even if it was a Mustang they all use the same type of bushings for the control links. I used '87 Granada as a base on my NAF. I got them from Westbay Auto. Think it was about $35 for all of them(10) just a rubber bushing nothing special.
Do you have a 8 or 9 in rear axle? Not that it would make a difference for the bushings.
Check your diff for a Ford part number, it should be stamped on the housing. The number will at least tell you what Ford model/models it came from if not the exact year by cross-referencing the code. I learned this little fact "after" the fact
