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The sidewalls would budge more, yeah, if that's what you mean. But that doesn't have to be detrimental, quite the opposite if you're off-roading actually. Lots of people run 12.50 on 8-inchers without problems, me included.
I don't know if you can still pick up the OEM rallyes from GM, you'd have to ask a dealer. I doubt you can, but you might still be able to pick up a coupla trim rings. But used rallyes ain't that hard to find from what I've seen.