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 WarningRelieving Fuel Pressure Warning
Warning: Remove the fuel tank cap and relieve the fuel system
pressure before servicing the fuel system in order to reduce the risk of
personal injury. After you relieve the fuel system pressure, a small amount of
fuel may be released when servicing the fuel lines, the fuel
injection pump, or ...
Headlamp Aiming Procedure
Open the hood.
Measure from the floor to the center of the headlamp bulb. Some
headlamps have an aim dot marked on the headlamp lens.
At the screen, measure from the floor and place the horizontal tape at
the measured distance.
Measure from the reference line on the floor to the le ...
Windshield Washer Pump Replacement
Removal Procedure
Remove the front wheelhouse liner. Refer to Front Wheelhouse Liner
Replacement.
Disconnect the washer pump electrical connector (1).
Disconnect the washer pump hose (2) from the washer pump (3).
Using a small flat-bladed tool, remove the washer pump from the washer ...