I've also been inquiring about the proper backspacing. Everyone that I've messaged with says that 5" backspacing is ok and will work fine. I just traded some rims for some 15 X 8 ralley's. If my measurements are right, we could go with as much as 5.75" of b/s in the rear and still be ok (coil suspension). But unless you're going with some really wide tires, 5" b/s should do you fine. I believe TXfirefighter also had 17 X 8 with 5" b/s on the green stepside also.
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