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 WarningMild Steel
This information provides repair recommendations and general guidelines for
steel classified as Mild Steel. This type of steel normally has a
tensile strength less than 270 MPa. This includes the common steel names of:
Mild Steel
Bake Hardenable Steel (BH)
Solid Solution Strengthened Stee ...
Front 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 ...
Removal Procedure
Warning: Refer to Approved Equipment for Collision Repair Warning in the
Preface section.
Warning: Refer to Collision Sectioning Warning in the Preface section.
Warning: Refer to Glass and Sheet Metal Handling Warning in the Preface section.
Disable the SIR System. Refer to SIR Disabling ...