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 WarningCourtesy Transportation Program
To enhance your ownership experience, we and our participating dealers are proud
to offer Courtesy Transportation, a customer support program for vehicles with the
Bumper-to-Bumper (Base Warranty Coverage period in Canada), extended powertrain,
and/or hybrid-specific warranties in both the U.S ...
Installation Procedure
Clean and prepare the attaching surfaces for welding.
Position the roof rear header panel (1) on the vehicle.
Verify the fit of the panel.
Clamp the roof rear header panel into position.
Spot weld accordingly as noted from the original panel.
Apply the sealer ...
Turn Signal Switch Replacement
Preliminary Procedure
Remove the steering column upper trim cover. Refer to Steering Column
Upper Trim Cover Replacement.
Remove the steering column lower trim cover. Refer to Steering Column
Lower Trim Cover Replacement.
Turn Signal Switch
Procedure
Disconnect any elec ...