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 Wheel Speed Sensor Replacement
Removal Procedure
Warning: Refer to Brake Dust Warning.
Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle.
Remove the tire and wheel assembly. Refer to Tire and Wheel Removal
and Installation.
Remove the rear wheel speed sensor ...
Front Wheel Drive Intermediate Shaft Replacement
Front Wheel Drive Intermediate Shaft Replacement
Callout
Component Name
Preliminary Procedure
Raise and support the vehicle. Refer to Lifting and Jacking the
Vehicle.
Remove the wheel drive shaft assembly from the vehicle ...
Electrical Center Identification Views
Figure 1:
X70A Relay Block - Underhood Label (LUV)
Figure 2:
X70A Relay Block - Underhood, Top View (LUV)
Figure 3:
X50A Fuse Block - Underhood Label (LUV)
Figure 4:
X50A Fuse Block - Underhood Label (LUW)
...