Here is a suggestion if the suspension is still attached to the car. Extend the existing studs with a nut and cut threaded rod. Using an additional nut as a backstop for the wheel's mounting surface, bolt on your existing wheels. After removing the shocks, you can then jack the wheel through it's full range of motion and check for interference. I used this method to determine the optimum spacing for the 19" wheels I fit on my GT5. I didn't want to spend that much money on a set of custom bot anchors.
I was surprised to see how quickly the wheel is pulled in toward the wheelhouse when the suspension is under compression.
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