WARNING: This page is about a different car, the 2009 Pontiac Torrent and 2009 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: View Of Rear Seat Shoulder Belt Guide
Courtesy of GENERAL MOTORS CORP.
Callout
Component Name
1
Rear Seat Shoulder Belt Guide Plastic Push Pin Retainer