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Bumping a nearly 4 month old request here but in case you never found anything, I found a pretty similar set in JollyGreen's thread while looking for this style recently.
http://www.ebay.com/itm/300709168849?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1497.l2649
Well it turns out gmcyukondriver was right, that eBay listing I posted did in fact turn out to be GMC corners. On the bright side, they're great and I'm keeping them for the Suburban.
EDIT - Forgot to say, add me to the list of people looking for a couple sets of these if anyone ever finds them for Chevy again.