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 WarningFront Side Door Weatherstrip Replacement - Door Side
Front Side Door Weatherstrip Replacement - Door Side
Callout
Component Name
1
Front Side Door Weatherstrip Upper Retainer
Procedure
Open the front side door to the fully open position.
Remove the front side do ...
Rear Side Door Window Replacement (Sedan)
Rear Side Door Window Replacement
Callout
Component Name
Warning: Refer to Glass and Sheet Metal Handling Warning.
Preliminary Procedures
Remove the rear side door trim panel. Refer to Rear Side Door Trim
...
Instrument Cluster Upper Bezel Replacement
Instrument Cluster Upper Bezel Replacement
Callout
Component Name
1
Instrument Panel Cluster Upper Bezel
Procedures
Use a flat bladed plastic trim tool in order to disengage the retainers
securing the instrume ...