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You didn't ask about pricing, but might as well cover it. If you buy right away, don't expect much "wiggle" room with respect to the cost. Wait a while and you'll be able to get them below sticker and maybe even a rebate.
Rustproofing. No.
Extended warranty. Depends on how long you plan to keep it. If longer than GM's warranty, then probably yes. With the complexity of today's cars, you could cover the cost of the warranty with one repair.
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