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 WarningOff-Road Recovery
The vehicle's right wheels can drop off the edge of a road onto the shoulder
while driving. Follow these tips:
1. Ease off the accelerator and then, if there is nothing in the way, steer the
vehicle so that it straddles the edge of the pavement.
2. Turn the steering wheel about one-eight ...
Installation Procedure
Clean and prepare the attaching surfaces for welding.
Apply structural adhesive to the attaching surfaces.
Position the body rear end panel on the vehicle.
Verify the fit of the body rear end panel.
Clamp the body rear end panel into position.
Spot weld accordingly as no ...
Front End Inflatable Restraint Discriminating Sensor Replacement
Warning: Refer to SIR Warning in the Preface section.
Warning: Following the deployment of a side impact air bag, inspect the
following parts for damage. Replace these parts if
necessary:
The seat cushion frame
The seat recliner, if equipped
The seat adjuster
The seat back frame
...