Like stated your bolt pattern should be 5 on 4.75. And on backspacing you will want to stay close to 6. If your wanting to get a 15x8 rim then you will really want to stay close to 6 because thats a 1 inch wider rim already so ur tires are going to stick out 1 inch more and if you get like a 4 inch backspacing rim ur tires will be out 3 inchs. Thats alot if you dont have any lift then you will most likely rub on the flares when turning. Hope that helps.