According to the parts manual (Parts Manual for 2006-2012 Impala - Chevy Impala Forums
), you can't even buy them separately - you have to buy the whole big, long woodgrain piece that they are in (which is like $350/$400 new!).
Best bet would be to find a used one and just replace the entire piece or try to remove them from that used piece and put them into yours.
Were you able to easily remove/reinstall the vent mechanisms on yours - I've never really heard if you can or cannot remove/install the vents individually...
BTW - can a mod please sticky the post with the parts manual? It seems most people never even see the post - would be helpful if it were stickied.
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