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 WarningRear Spring, Insulator, and Jounce Bumper Replacement
Rear Spring, Insulator, and Jounce Bumper Replacement
Callout
Component Name
Preliminary Procedure
Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle.
1
Rear Spring
Proced ...
Front Wheel Drive Shaft Seal Replacement - Torque Converter Housing Side
Front Wheel Drive Shaft Seal Replacement - Torque Converter Housing
Side
Callout
Component Name
1
Front Wheel Drive Shaft Oil Seal Assembly
Special Tools
DT-23129 Universal Seal Remover
DT-47790 Seal Insta ...
Special Tools
Illustration
Tool Number/Description
207649
Rod Hairpins
547324
Flange Screws
EN-232
KM-232
J-21867-L40
Oil Pressure Check Adapter
...