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 WarningAccident With or Without Air Bag Deployment - Component Inspections
Warning: Proper operation of the Supplemental Inflatable Restraint
(SIR) sensing system requires that any repairs to the vehicle
structure return the vehicle structure to the original production configuration.
Not properly repairing the vehicle structure could cause
non-deployment of the air b ...
Instrument Panel Wiring Harness Replacement
Removal Procedure
Remove instrument panel compartment assembly. Refer to Instrument
Panel Compartment Replacement.
Remove instrument panel wiring harness (2) from instrument panel tie bar
(1).
Disconnect electrical connectors.
Installation Procedure
Ins ...
Waterleak Test Preparation
GM vehicles are designed to operate under normal environmental
conditions.
The design criteria for sealing materials and components takes into
consideration the sealing forces required to withstand the natural
elements. These specifications cannot take into consideration any artificial ...