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Based on the shims that were on each stud with the stock arm, we subtracted significantly but kept the approximate ratio. In other words, this side started with about 1/4 and 3/8, and we ended up with 1/16 and 1/8. Then we set the vehicle down and held a level vertically to the outside edge of the wheel. This is a glorified version of "eyeballing it," but it will get you down the road and to your appointment at the alignment shop.