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 WarningDoor Lock and Ignition Lock Folding Key Blade Removal and Installation
Special Tools
BO-51098 Flip Key Blade Fixture
For equivalent region tools, refer to Special Tools.
Caution: Failure to properly support the Remote Keyless Entry
(RKE) transmitter assembly while replacing the key blade may cause internal
damage to the transmitter assembly. ...
Torque Converter Housing Cleaning and Inspection
Torque Converter Housing Cleaning and Inspection
Callout
Component Name
Caution: After cleaning the transmission components, allow
to air dry. Do not use cloth or paper towels in order to dry any transmission
compone ...
Torque Converter Housing with Fluid Pump Assembly Installation (6T30)
Torque Converter Housing with Fluid Pump Assembly Installation
Callout
Component Name
1
Fluid Pump Seal Assembly
2
Torque Converter Housing Gasket
3
Torque Converte ...