Hey i found a set of american racing 15x8 rims on craigslist in my town. He said all he knows is they have a 19mm offset which i believe is 5.5 backspacing but not sure, Anyway he bought them for his 95 blazer but they stuck out a little. Would these fit a 91 firebird with factory 15x7's without any spacers or rubbing? Thanks!

 

19 mm is 3/4 inch. So the BS is 3.75", and you can't use them on the front.

 

-19 is 3.75, +19 is 5.25. If they are the latter they will be OK on the back, not sure about the front.