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Can you clear 37x12.5x20s on a stock 07 F350 with just cut out flares? And I'm assuming if you used the stock wheels you'd need spacers? Any idea on how large?
The radius on cutouts is designed to match a 42" tire, 37s would look dinky under those, also they would look really narrow as suggested. They add about 4.5" of width to each side, so you need a big meaty tire for them to look good.