Overlap, may be you could tell what car you prepare assuming its use is track only and what series you will enter (pre '66 ou Group1, 2…). If you use a Mac Pherson, the ARB has several uses. In any regulation, the ARB diameter is free but must not be hollow design. And you're not allowed to move any suspension attachement, chassis or cross member. You can also take in count the ride height, front and rear balance, and if you have a live axle is it cranked or not?
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