If you go to,
http://www.gmpartsdirect.com/catalog/frameset.cfm .The part you need is available. The dealer must have overlooked it. If you need the part number I can get it for you Monday. (I thought the link would be a picture of your part) after you go to your year, make, model, go to rear door, then glass and hardware, then latch and hardware, then latch assembly, then view illustration. Hope this helps.