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 WarningRear Bumper Fascia Guide Replacement
Preliminary Procedure
Remove the rear bumper fascia. Refer to Rear Bumper Fascia Replacement.
Rear Bumper Fascia Guide Rivet (Qty: 4)
Special Tools
BO-594-A Hand Rivet Tongs
For equivalent regional tools, refer to Special Tools.
Rear Bumper Fascia Guide
Rear Bumper Fascia Inner ...
Fuel
Use of the recommended fuel is an important part of the proper maintenance of
this vehicle. To help keep the engine clean and maintain optimum vehicle performance,
we recommend the use of gasoline advertised as TOP TIER Detergent Gasoline.
Look for the TOP TIER label on the fuel pump to ensure ...
Installation Procedure
Create 6 x 20 mm (4/16 x 11/16 in) slots for MIG-brazing along the upper
edges of the service panel as noted from the original
panel.
Clean and prepare the attaching surfaces for brazing and spot welding.
Position the body lock pillar inner panel on the vehicle.
Verify the ...