I searched but found nothing that said if their is a difference. I am going to buy a 9" rear end that is built for a 93 Mustang, but I want to put the rims off my 68 Mustang onto this car. (The MT drag radials are already mounted and ready to go.) Will they fit? The 5 lug bolt circle on the 9" says it has 4.5" bolt circle. Are early model 5 lug rims 4.25 or 4.5?