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Your local GM dealer. (If they aren't discontinued.). That's where I got mine a few years back. If you are missing the rubber isolators on those behind the panel, you will probably want those, too. They really cut down rattling noises in the panel.
A quarter is the last thing I tried, but it still kind of messed them up.
Sorry. Nickel. One of the coins in my pocket is a perfect fit. It's been a while for me. As long as the device in there is the perfect thickness, it won't get chewed up.