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 WarningBody Side Trim Panel Replacement - Left Side
Preliminary Procedure
Remove the rear side door sill trim plate. Refer to Rear Side Door Sill
Trim Plate Replacement.
Remove the rear seat back. Refer to Rear Seat Replacement.
Remove the quarter window garnish molding. Refer to Quarter Window
Garnish Molding Replacement.
...
Heated Front Seats
WARNING
If you cannot feel temperature change or pain to the skin, the seat heater
may cause burns. To reduce the risk of burns, people with such a condition should
use care when using the seat heater, especially for long periods of time. Do not
place anything on the seat that insulates again ...
Removal Procedure
Warning: Refer to Approved Equipment for Collision Repair Warning in
the Preface section.
Warning: Refer to Glass and Sheet Metal Handling Warning in the Preface
section.
Disable the SIR System. Refer to SIR Disabling and Enabling.
Disconnect the negative battery cable. Refer to Bat ...