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Gentlemen,
Also in conclusion let me ask a question. So if Eric and I both have the 6" or 6.5" stud length then this should ensure that our cars officially did come with 15" rims being either steel or rallye? I don't have my broadcast sheet but I was thinking one of the previous owners did tell me that it had rallye wheels on it when he bought it as the second owner. Is this safe to assume?

You could have a space saver spare with either 14" or 15" wheels, same with the standard spare tire.If you have 15" ralleys then use them. They fill in the wheel well better anyway and look better too.