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 WarningExterior Lamp Controls
The exterior lamp control is on the instrument panel to the outboard side of
the steering column.
There are four positions:
(Off): Briefly turn to this position
to turn the automatic light control off or on again.
AUTO (Automatic): Turns the headlamps on automatically at normal brightness, ...
Floor Mats
Warning
If a floor mat is the wrong size or is not properly installed, it can interfere
with the pedals. Interference with the pedals can cause unintended acceleration
and/or increased stopping distance which can cause a crash and injury. Make sure
the floor mat does not interfere with the pe ...
Radio Programming and Setup
Note:
DO NOT program a control module unless directed to by a service procedure
or a service bulletin. If the ECU is not properly configured with the correct
calibration software, the ECU will not control all of the vehicle features
properly.
Ensure the programming tool is ...