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 WarningLiftgate Hinge Replacement
Liftgate Hinge Replacement
Callout
Component Name
Preliminary Procedures
Remove the liftgate. Refer to Liftgate Replacement.
Lower the rear of the headliner to access the inner bolts. Refer
to Headlining Trim Panel Replac ...
Rear Window Replacement
Special Tools
BO-24402-A Glass Sealant Remover (Cold Knife)
BO-39032 Stationary Glass Removal Tool
Use an adhesive that is approved by GM
For equivalent regional tools, refer to Special Tools
Removal Procedure
Warning: If a window is cracked but still intact, crisscros ...
Outside Rearview Mirror Housing Replacement
Outside Rearview Mirror Housing Replacement
Callout
Component Name
Preliminary Procedures
Remove the outside rearview housing cover. Refer to Outside Rearview
Mirror Housing Rear Cover Replacement.
Remove the outside rear ...