15x8 or 15x10 will both work/fit. its all on preference, if you want the whole tire to touch the ground and wear good i recommend 15x10, a 15x8 will bulge the tire more and wont have as much contact patch.
15x10 with 3.625"-4" backspacing should work good. I know most are 3.625 that is what i have
15x8 a 3.25"-4" backspacing will work well too. the less backspacing the more the wheel/tire sticks out the fenderwell