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 WarningAutomatic Transmission
It is better not to park with the engine running.
If the vehicle is left with the engine running, follow the proper steps to be
sure the vehicle will not move.
If parking on a hill and pulling a trailer.
The automatic transmission has a shift lever located on the console between the
seats.
...
Removal Procedure
Warning: Refer to Cracked Window Warning in the Preface section.
Warning: Refer to Glass and Sheet Metal Handling Warning in the Preface section.
Note: Position the vehicle on level ground and move the front
wheels to the straight-ahead position.
Disconnect battery.
Remove quarter window ...
Relieving 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 ...