I still have my stock ones from when I replaced mine. I took a look at them and some of the brackets are broken, but I bet you could use some double sided tape to tape them back (that is what they use from the factory: double sided tape plus brackets). I took a couple of pictures.
Lets say $5 plus whatever it costs to ship? PM or email me if you are interested.
P.S. The mods will probably move this into the wanted section...just fyi.
Unfortunately no. The mirror caps are a non-servicable item (meaning you can't just go to a GM parts counter and buy them). GM will only sell you the entire mirror assembly (which will range up to $200-$300). Short of buying them used...these are the only people (that I know of) that sell them.
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