For service and parts needs, visit your dealer. You will receive genuine GM parts and GM-trained and supported service people.
Genuine GM parts have one of these marks:

Vehicle Care
California Proposition 65 WarningInstallation Procedure
Drill 8 mm (5/16 in) for plug welding along the edges of the service
panel as noted from the original panel.
Clean and prepare the attaching surfaces for welding.
Apply one-part windshield urethane adhesive as noted
from the original panel.
Position the roof ...
Backup Lamp Replacement
Preliminary Procedures
Remove the rear compartment sill trim plate. Refer to Rear Compartment
Sill Trim Plate Replacement.
Disconnect the electrical harness connector from the backup lamp socket.
Back Up Lamp Nut (Qty: 4)
Caution: Refer to Fastener Caution in the Preface ...
SIR System Description and Operation
SIR System Overview
The supplemental inflatable restraint (SIR) system supplements the protection
offered by the occupants Seat Belt System (2). The SIR
system may contain several inflator modules located throughout the vehicle, i.e.
steering wheel module (1), instrument panel module (1),
...