Am I thinking about this all wrong or shouldn't you just be able to measure how far the tire sticks out beyond the stock fender? I have the CSP 4CM widened fenders running 17X8.5 et is 54 I believe. I have about 1.5 inch from the lip. I have purchased a set of Hartmann 3 piece wheels. Rears are 18X9.5 et 15, I believe these will fill out the fenders nicely.
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