WARNING: This page is about a different car, the 2003 Pontiac Montana, 2003 Oldsmobile Silhouette, and 2003 Chevrolet Venture. However, it is still accessible from the selected car via links, so may be relevant.
Open the liftgate.
Remove screws from liftgate striker.
Remove liftgate striker and spacer from vehicle.
Fig 1: Removing Liftgate Latch Striker From Vehicle