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I went to to one of the installers recommended by Tire Rack. Costco and Sears said they would not install non-runflats on a car originally equipped with RunFlats.
My tires are the same width as the OEM tires just with a taller sidewall, so I don't think theres much of a difference on the width. Let me know if that pic on the exhaust tip thread works for you, if not, let me know what kind of pic do you want and I'll post it.