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
Note: If the location of the original plug weld holes can not be
determined, space the plug weld holes every 40 mm (1½ in).
Drill 8 mm (5/16 in) for plug welding along the edges of the body rear
end panel as noted from the original panel.
Clean and prepare the attaching s ...
Voice Recognition
Voice recognition allows for hands-free operation of the infotainment system
features.
Voice recognition can be used when the radio is on or when Retained Accessory
Power (RAP) is active.
See “Retained Accessory Power (RAP)” in the owner manual. The system maintains
a minimum volume level.
...
Rear Side Door Weatherstrip Replacement - Body Side
Rear Side Door Weatherstrip - Body Side
Procedure
Start at the front upper corner of the door opening and pull the
weatherstrip away from the door opening flange.
Position the weatherstrip in the upper corner of the center pillar.
Working downward along the front edge, in ...