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 WarningInflatable Restraint Sensing and Diagnostic Module Programming and Setup
Special Tools
EL-49642 SPS Programming Support Tool
For equivalent regional tools, refer to Special Tools.
Note:
DO NOT program a control module unless directed to by a service procedure
or a service bulletin. If the ECU is not properly configured with the correct
calibration ...
Brake Pressure Modulator Valve Replacement
Removal Procedure
Warning: Refer to Brake Fluid Irritant Warning.
Caution: Refer to Brake Fluid Effects on Paint and Electrical
Components Caution.
Caution: Always connect or disconnect the wiring harness connector
from the EBCM/EBTCM with the ignition switch ...
Vehicle, Engine and Transmission ID and VIN Location, Derivative and Usage
The vehicle identification number (VIN) plate is the legal identifier of the
vehicle. The VIN plate is located on the upper left corner of the instrument panel
(I/P) and can be seen through the windshield from the outside of the vehicle:
Vehicle, Engine and Transmission ID and VIN Loca ...