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 WarningExterior Lighting Systems Description and Operation
Exterior Lamps
The exterior lighting system consist of the following lamps if equipped:
Backup lamps
Front fog lamps
Hazard warning lamps
Headlamps
Park, tail and license lamps
Stop lamps
Turn signal lamps
Low Beam Headlamps
The body control module ...
Parking Brake Adjustment (Drum Brake)
Note: The park brake cable adjusting nut is a nylon lock type. Use
ONLY HAND TOOLS whenever tightening or loosening the adjusting nut.
Apply and fully release the park brake several times. Verify that the park
brake lever releases completely.
Turn ON the ignition. Verify the red B ...
Camshaft Timing Chain Installation
Special Tools
EN-952 Fixing Pin
EN-953-A Fixing Tool
EN-955-10 Fixing Pin from EN-955 Kit
For equivalent regional tools, refer to Special Tools.
The engine should be adjusted to TDC.
The crankshaft should be locked with EN-952 fixing pin.
The camshaft should be locked with EN-9 ...