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 WarningMalfunction Indicator Lamp
A computer system called OBD II (On-Board Diagnostics-Second Generation) monitors
the operation of the vehicle to ensure emissions are at acceptable levels, helping
to maintain a clean environment.
The malfunction indicator lamp comes on when the vehicle is placed in ON/RUN
for key access or ...
Rear Brake Rotor Replacement
Special Tools
CH 41013 Rotor Resurfacing Kit
CH 42450-A Wheel Hub Resurfacing Kit
For equivalent regional tools, refer to Special Tools.
Removal Procedure
Warning: Refer to Brake Dust Warning in the Preface section.
Remove rear brake caliper bracket. Refer to Rear Brake Caliper Br ...
Power Steering Gear Inlet Pipe/Hose Replacement
Removal Procedure
Remove front bumper fascia. Refer to Front Bumper Fascia Replacement
Remove as much power steering fluid from the remote power steering fluid
reservoir as possible.
Place drain pans under the vehicle as needed.
Remove power steering gear inlet hose bolt (1).
...