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 WarningSafety Belt Use During Pregnancy
Safety belts work for everyone, including pregnant women. Like all occupants,
they are more likely to be seriously injured if they do not wear safety belts.
A pregnant woman should wear a lap-shoulder belt, and the lap portion should
be worn as low as possible, below the rounding, throughout ...
Floor Carpet Drying
If the carpet or the pad or insulator is wet, use the following criteria for
drying or for replacing the components:
For a 1-piece carpet assembly bonded to a cotton or a fiber padding,
replace the entire assembly
For a 2-piece carpet assembly with a cotton or a fiber padding, replace
...
Destination
If route guidance is not active, press the Destination Entry screen button on
the Home Page to access the Destination Entry screen. Several options can be selected
to plan a route by entering destinations.
Some destination entry items such as Previous Destinations, Address Book, and
My Home ...