I don't have an answer for your question, but want to give you a heads up on something I read about these adjustable rear arms. At least some versions require the rear wheel to be removed to make adjustments. Understandably, this would annoy the alignment tech and can result in a service that will be more expensive.So I see that most here have fixed the alignment issue by installing SPC adjustable cambers. After I order these I will have to look for a shop that can install and do the alignment which I understand can be tedious. How much more can I expect these alignment places to charge vs. Sears, express tire, firestone who charge about $79 here in san diego?