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 WarningEnvironmental Fallout (Acid Rain)
Caution: Refer to Clearcoat/Ultraviolet Screeners Caution in the
Preface section.
Note: Always refer to the manufacturer's packaged instructions for
the detailed procedures of materials used for compounding and/or
polishing.
Since the severity of the condition varies from area to area, proper ...
Installation Procedure
Align the rear compartment floor panel.
Drill 8 mm (5/16 in) for plug welding along the edges of the rear compartment
floor panel as noted from the original panel.
Clean and prepare the attaching surfaces for
welding.
Position the rear compartment floor panel on the vehicle.
V ...
Exterior Lighting Systems Description and Operation
Exterior Lamps
The exterior lighting system consists of the following lamps if equipped:
Headlamps
Daytime Running Lamps (DRL)
Front fog lamps
Rear fog lamps
Park, tail and license lamps
Turn signal lamps
Hazard warning lamps
Repeater lamps
Stop lamps
Backup lamps
Low Beam ...