I have a pair of 15x8's that were on my T Type, I would love to get a set of 15x10's.... Did you have yours on a GN? I have no idea what fits these cars as far as backspacing. Let me know what other info you'd like and I can try to get it.
but ya sorry guys the 15x10s were actually on a newer mustang, I didnt have them on a G body. I bought them just for the tires, they wont fit my car either.