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 WarningCommunication Interface Module Bracket Replacement
Communication Interface Module Bracket Replacement
Callout
Component Name
Preliminary Procedure
Remove the instrument panel lower compartment. Refer to
Instrument Panel Lower Compartment Replacement
1
...
Steering Wheel Horn Contact Replacement
Steering Wheel Horn Contact Replacement
Callout
Component Name
Preliminary Procedure
Remove the steering wheel inflatable restraint module. Refer to Airbag
Steering Wheel Module Replacement.
1
S ...
Turbocharger Wastegate Regulator Solenoid Valve Replacement
Charge Air Bypass Regulator Solenoid Valve Replacement
Callout
Component Name
Preliminary Procedure
Disconnect the radiator outlet hose from the water inlet. Refer to
Water Inlet Replacement.
1
T ...