I bought the "Door Window Felt Kit" from the Truck Shop. (I am in NC so I went to the store but they ship too.
www.truckandcarshop.com) The felt kit included upper door glass channels, anti-rattle window seals, and universal division bar inserts. This solved my window rattle problems.
I looked them up and they do offer the kits for a suburban. One kit for the front ($115) and another kit for the rear ($95).