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He put them on to see what they would look like, not to keep them on... I hope. From what I can see in the avatar-sized pictures, the Mustang rims look ok.
I don't think it looks bad. But if you roll them, make sure the Cobra R centercaps are removed. I think some black powdercoated Y2K R's would actually look awesome and you could rotate those as well. The only problem is that they're heavy. But I heard the 19x10" rear Nismo wheels are already heavy at 29 lbs a piece.