Did you have to special order a specific back spacing? I looked on their website and everything looked like factory back spacing. I am debating whether to special order a set of steal rims and going with white lettered 15s with dog dish caps or going with the more modern look with the mustang Bullitt 17s.
5" BS on a 7" rim. 5 1/4" would have centered it perfectly. But this is in my case. Would need to carefully measure to see what you would need. Think a 8" with 5 3/4" BS would work well too. This is with a 65 B body rear.
Spent a little more for special order, turned out great.