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
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 ...
Navigation System
If the vehicle has a navigation system, there is a separate navigation manual
that includes information on the radio, audio players, and navigation system.
The navigation system provides detailed maps of most major freeways and roads.
After a destination has been set, the system provides turn-b ...
Wipers and Washers
Specifications
Wiper/Washer Schematics
Windshield Wiper and Washer Switch Replacement
Preliminary Procedure
Remove the steering column trim covers. Refer to Steering Column Lower Trim
Cover Replacement.
Windshield Wiper and Washer Switch
Procedure
Disconnect any elect ...