I have a set of cragar SS wheel that came with the car, when i bought it. The car came also with the stock MustangII wheels.
I'm still not sure if both wheels can by balanced on a balancing machine that's using a cone to center the wheel.
I know this problem from my 66 Mustang: the center hole is excentric and the wheels are centered by the lug nuts. I didn't find someone around that could balance the wheel "on the lug nuts", because they all have this cone balancing machines...
My solution was to buy new wheels because i also wanted some 15x7 and there is a nice (and cheap!) steel wheel made in europe that had enough backspacing to fit the car.
The cragar SS have this elongated holes (see picture) for the studs and this special lug nuts to center the wheel, but the question is, if the center hole is excentric or not?!
The same thing on the stock wheels: is the center hole is excentric or not?!
I found some steel wheels from an modern french car that should be very similar to the stock wheel except they are 15'' in diameter:
5,5x15, ET8
Advantage of them would be that I will have no issues to get my licenes plates (some TÜV inspectors go crazy about diffrent wheels esspecialy with the cragar wheels), they can be balanced everywhere and there are much more tires available then in 13''. 195/50R15 and 185/55R15 would fit perfect.
Perhaps they whould look ok with some crome rings on them... But i would like to use the original wheel instead.