Sorry to bug you again RedRock but I finally found a set of wheels I like at a good price. They are 17 X 9 with -12mm Offset and 4 1/2" Backspace . Am I going to need to need a spacer? I was going to go with 17 X 8 that had 4.6" backspacing, but the wheels that I settled on come in the aforementioned spec instead. Since the wheel is 1" wider, am I going to need a 1/2 spacer or a 1" spacer or none at all? I'm going iwth 315/70-17 BFGoodrich All Terrain K/O's, so the tire size is the same as yours.