New wheels

The mustang rims are not metric, they are unbelievably 4.5 bolt pattern ( in a metric world. ) the center register needs to be opened up so the hub will fit inside the wheel. It's not a lot of cutting, and your local machine show can probably do 4 for about $50. The plastic center caps can't be used in the front because the mopar bearing dust cover is too tall, but reilly motorsports sells center caps that will fit. I see a few guys are using wheels spacers, whether that'll be the case with your B body rear is where you need to concentrate your research.