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 WarningHood Rear Weatherstrip Replacement
in
Hood Rear Weatherstrip Replacement
Callout
Component Name
1
Hood Rear Weatherstrip
Procedure
The hood rear weatherstrip is held in place with 10?€‰plastic retainers
that are part of the air inlet grille. ...
Shock Absorber Disposal
Warning: Use the proper eye protection when drilling to prevent metal
chips from causing physical injury.
Clamp the strut in a vise horizontally with the rod (1) completely extended.
Drill a hole in the strut at the center of the end cap (3) using a 5 mm
...
K20 Engine Control 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 control module is not properly configured
with the correct ...