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 WarningInstallation Procedure
Drill 8 mm (5/16 in) for plug welding along the edges of the rear bumper
impact bar stud plate as noted from the original panel.
Note: If the location of the original plug weld holes can
not be determined, space the plug weld holes every 40 mm (1½ in).
Clean and prepare the ...
Instrument Panel Cluster Lower Trim Plate Replacement
Preliminary Procedure
Remove instrument panel cluster trim plate. Refer to Instrument Panel Cluster
Trim Plate Replacement.
Instrument Panel Cluster Lower Trim Plate Screw (Qty: 4)
Caution: Refer to Fastener Caution in the Preface section.
Tighten
2.5 N·m (23 lb in)
Instrument Pa ...
Steering Gear Replacement (Hydraulic Power Steering)
Special Tools
EN 45059 Torque Angle Sensor Kit
For equivalent regional tools, refer to Special Tools.
Removal Procedure
Turn the front wheels to the straight forward position and secure the
steering wheel from moving.
Remove the lower steering intermediate shaft bolt (1).
...