Just wondering what the stock bolt pattern is on a GT. Pops picked up 2 sets of 20' wheels that look the same as the 1966 mustang styled steel wheel, only bigger of course. We both think theyd look pretty good on the GT as it would make it look even more retro. The wheels are 5 on 4 1/2' . Would these fit? any other info would be nice too for switching wheels. Thanks!