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Maybe another member can confirm this but I believe this is the factory one and will fit your truck even though they don't list it in their fitment list: http://www.ebay.com/itm/OEM-GM-LUGG...oe&vxp=mtr&hash=item1c1f5a1f87#ht_3900wt_1176
Sent PM. I have the cross rails if you need em! Lemme know.
I just . . . installed an Esky roof rack.