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 WarningFront Side Door Window Regulator Motor Replacement
Preliminary Procedure
Remove the front side door window regulator. Refer to Front Side Door Window
Regulator Replacement.
Front Side Door Window Regulator Motor Screw (Qty: 3)
Caution: Refer to Fastener Caution in the Preface section.
Tighten
9 N·m (80 lb in)
Front Side Door Wind ...
Doing Your Own Service Work
WARNING
It can be dangerous to work on your vehicle if you do not have the proper
knowledge, service manual, tools, or parts. Always follow owner manual procedures
and consult the service manual for your vehicle before doing any service work.
If doing some of your own service work, use the pro ...
Interior Windnoise
Warning: Refer to Assistant Driving Warning in the Preface section.
Interior windnoise is not heard when the window is lowered. Interior
windnoise is caused by the air leaving the inside of the vehicle
through a seal or a seam.
Tape over the relief valves to cause added air pressure wi ...