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:

California Proposition 65 WarningAudible Warnings Description and Operation
The audible warnings alert the driver of a system concern or a critical vehicle
condition. The radio generates the audible warnings through the speakers. The radio
receives audible warning requests via the serial data circuit. If the radio receives
multiple audible warning requests, the warnin ...
Fuel Tank Heat Shield Replacement
Removal Procedure
Support the fuel tank with a suitable jack.
Remove the fuel tank strap fasteners (1) and lower the fuel tank straps (2).
Remove the fuel tank heat shield fasteners (1) and remove the fuel tank
heat shield (2).
...
Intake Manifold Replacement (LUW)
Removal Procedure
Disconnect the negative battery cable. Refer to Battery Negative Cable
Disconnection and Connection.
Remove the throttle body assembly. Refer to Throttle Body Assembly Replacement.
Disconnect wiring harness plug.
Disconnect the pipes from ...