small bolt pattern 15" wheels?

I ordered a set of 15x8 rallys in the SBP for my fish and Summit said I got the last 2 they had. Luckily they were in GA so shipping should be faster. I got the centers Friday and hopefully the wheels today. The car will run 255-60 or maybe larger rears depending how they fit (I have a free set of 255-60s whick I will mount, evaluste the remaining available fenderwell, and then burn off. In front there are 195-60s on smaller width 14" wheels. Trying to make the stance work.