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 WarningRemoval 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 ...
Repairs and Inspections Required After a Collision
Warning: Restraint systems can be damaged in a collision. To help
avoid injury and ensure that all parts in need of replacement are
replaced:
Replace any seat belt system that was in use during the
collision serious enough to deploy any automatic restraint device such as
air
bags and ...
Rear Side Door Upper Hinge and Lower Hinge Replacement
Preliminary Procedure
Remove the rear side door. Refer to Rear Side Door Replacement.
Rear Side Door Hinge Bolt (Qty: 4)
Caution: Refer to Fastener Caution in the Preface section.
Tighten
25 N·m (19 lb ft)
Reart Side Door Hinge
Procedure
Adjust rear side door as needed. Refer ...