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 and Non-Folding Key Cutting
High Security keys are available from the service parts system.
Obtain the key code from the security card or from the GM Dealer World, Parts,
Key Code Look Up system.
If you have the key code and access to a Triax-E., BD Laser or other code key
cutting machine from the GM Dealer Equipment C ...
Engine Oil Cooler Replacement
Removal Procedure
Disconnect battery negative cable. Refer to Battery Negative Cable Disconnection
and Connection.
Drain engine coolant. Refer to Cooling System Draining and Filling
Remove the turbocharger oil feed pipe. Refer to Turbocharger Oil Feed
Pipe Replacement ...
Control Valve Body Assembly Assemble (Gen 1)
Control Valve Body Assembly Assemble
Callout
Component Name
1
Valve Body Ball Check Valve (Qty: 6)
2
Control Valve Channel Plate Spacer Plate Assembly
3
...