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 WarningPower 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).
...
Rear Side Door Adjustment
Rear Side Door
Caution: Refer to Fastener Caution in the Preface section.
Procedure
Loosen the rear door hinge bolt (Qty: 4) to adjust the rear door.
Adjust the rear door in order to obtain an even gap between the rear
door and the roof, the quarter outer panel, the
rocker pan ...
Rear Side Door Replacement
Preliminary Procedure
Remove the rear side door trim panel. Refer to Rear Side Door Trim
Replacement.
Rear Side Door Check Link Bolt
Caution: Refer to Fastener Caution in the Preface section.
Procedure
Remove the water deflector
Disconnect the door electrical connector.
Suppo ...