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I'm going to go get the rims/tires today. I'll ask him if it doesn't fit, that I can return it back to him. Although it should fit, if not I could always sell it to the RSX guys etc.
Why not just jack the car up and toss the wheel on before buying them? I'm sure he wouldn't mind you test fitting. You'd only need to test fit one of them.
I can't think of a reason they wouldn't... SilverMS3 said in another thread the 17" 6 wheels were 52mm offset, which is the same as the stock wheels on teh MS3.