I'm pretty sure they wont. Theres a difference between the "New Edge" and the S197s 5 lug bolt pattern. I'd put money on it that they dont fit, Sorry. Check the bolt pattern, I believe backspacing wouldnt really matter that much since its not a crazy type of wheel
All newer Mustangs use a 5x4.5" lug patten. Will the wheels fit, yes. It will look stupid though. The S197 cars use a deeper backspace, so the wheels will be tucked in nasty.