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 Bumper Fascia Air Deflector Replacement
Front Bumper Fascia Air Deflector Replacement
Callout
Component Name
Preliminary Procedure
Remove the front bumper fascia opening lower cover. Refer to Front Bumper
Fascia Opening Lower Cover Replacement.
...
Shoulder Belt Replacement - Rear (Hatchback)
Shoulder Belt Replacement - Rear
Callout
Component Name
Preliminary Procedures
Remove the rear seat cushion. Refer to Rear Seat Cushion Removal
and Installation.
Remove the body lock pillar upper trim. Refer to Body Lock ...
Intake Manifold Installation
Clean the sealing surfaces.
Install the intake manifold (1) along with a NEW intake manifold gasket.
Caution: Refer to Fastener Caution.
Install the 6 intake manifold bolts (1) and tighten to 20 Y (15 lb ft).
...