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:

California Proposition 65 WarningHeated Front Seats
Warning
If you cannot feel temperature change or pain to the skin, the seat heater
may cause burns. To reduce the risk of burns, people with such a condition should
use care when using the seat heater, especially for long periods of time. Do not
place anything on the seat that insulates again ...
Taillamps, Turn Signal, Stoplamps, and Back-Up Lamps
Sedan Taillamp Shown, Hatchback Taillamp Similar
Back-up Lamp
Turn Signal Lamp
Stop Lamp/Taillamp
Sidemarker Lamp
To replace one of these bulbs:
Open the trunk.
Remove the two screws, which secure the taillamp assembly.
Remove the taillamp assembly by pulling it straight ...
Engine Oil Cooler Disassemble
Remove the oil cooler coolant inlet hose clamp (2).
Remove the oil cooler coolant inlet hose (1).
Remove the oil cooler coolant inlet pipe bolt (7)
Remove the oil cooler coolant inlet pipe (3) and the seal ring (6).
Remove the oil cooler coolant out ...