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 WarningFront Side Door Weatherstrip Replacement - Body Side
Front Side Door Weatherstrip - Body Side
Procedure
Start at the rear 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 ...
Vehicle, Engine and Transmission ID and VIN Location, Derivative and Usage
Note:: Graphic shows exemplary VIN.
The VIN plate is the legal identifier of the vehicle. The VIN plate is
located on the upper left corner of the instrument panel (I/P) and can
be seen through the windshield from the outside of the vehicle:
...
Steering
Electric Power Steering
The vehicle has electric power steering. It does not have power steering fluid.
Regular maintenance is not required.
If power steering assist is lost due to a system malfunction, the vehicle can
be steered, but may require increased effort. See your dealer if there is a ...