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 WarningInstallation Procedure
Cut the front compartment front rail in corresponding locations to fit
the remaining original panel. The sectioning joint should be
trimmed to allow a gap of one-and-one-half-times the metal thickness at the
sectioning joint.
Create a 50 mm (2 in) backing plate from the unused porti ...
Inflatable Restraint Roof Rail Modules
The roof rail modules are located under the headliner extending from the
front windshield pillar to the rear window pillar. The roof rail
modules contain a housing, inflatable air bag, initiating device, and a canister
of gas generating material. The initiator is part of the roof
rail module d ...
Front Fender Front Lower Bracket Replacement
Preliminary Procedure
Remove the front bumper fascia. Refer to Front Bumper Fascia
Replacement.
Remove the headlamp. Refer to Headlamp Replacement
Remove the front fender. Refer to Front Fender Replacement.
Front Fender Bracket Bolt
Caution: Refer to Fastener Caut ...