WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Removing/Installing Liftgate Body Side Wedge
Courtesy of GENERAL MOTORS CORP.
Open the liftgate.
Remove the bolt (3) securing the wedge (2) to the body side.