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 WarningWireless Communication Interface Antenna Replacement
Wireless Communication Interface Antenna Replacement
Callout
Component Name
Preliminary Procedure
Remove the communication interface module. Refer to
Communication Interface Module Replacement
1
...
Rear Side Door Opening Floor Carpet Retainer Replacement
Rear Side Door Opening Floor Carpet Retainer Replacement
Callout
Component Name
Preliminary Procedure
Remove the rear seat cushion. Refer to Rear Seat Cushion Removal and
Installation.
1
Rear Si ...
Instrument Panel Center Air Outlet Replacement
Instrument Panel Center Air Outlet Replacement
Callout
Component Name
Preliminary Procedure
Remove the instrument panel center molding. Refer to Instrument Panel
Center Molding Replacement.
1
In ...