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 WarningIntermediate Steering Shaft Replacement
Intermediate Steering Shaft Replacement
Callout
Component Name
Preliminary Procedure
Remove the steering column and the intermediate steering shaft as an
assembly. Refer to Steering Column Replacement.
1
...
Transmission Fluid Pump, Front Differential Carrier Baffle, and Front Differential
Ring Gear Removal (6T30)
Transmission Fluid Pump, Front Differential Carrier Baffle, and Front
Differential Ring Gear Removal
Callout
Component Name
1
Front Differential Carrier Baffle Bolts M6 x 25 (Qty: 2)
...
Radiator Air Baffle Replacement (LUV, LUW)
Radiator Air Baffle Replacement
Callout
Component Name
Preliminary Procedure
Remove the front bumper fascia assembly. Refer to Front Bumper Fascia
Replacement.
1
Radiator Air Upper Baffle Push P ...