Lowest backspacing
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Just so you don't have problems, there has been some fitment problems with some (not all) aftermarket 17 inch wheels on some 2005 and newer trucks. Ford went to a larger brake caliper sometime during the 05 model year. As for the wheels, I'd suggest 5.5 or 6 inches of backspacing. 5 inches of backspacing will also work if you want a wider stance.