What wheels fit what?

5x4.5" is the same thing as 5x114.3mm. Yes, the latter is metric. And it is also EXACTLY 4.5". So don't worry about it. And quite a few new cars run the 5x114.3 bolt pattern (all the "new" Ford Mustangs, also Nissan 350 and 370z's). But, new Challengers run 5x115mm, which, you guessed it, is not 4.5" (or 114.3mm).

Also, for the SBP crowd, 5x4" is NOT the same as 5x100mm. 4"=101.6mm, and no, that's not close enough.