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 WarningRoof
Specifications
Sunroof Schematics
Sunroof Component Views
Sunroof Frame
Sunroof Sunshade
Sunroof Window
Sunroof Window Seal
Sunroof Housing Rear Drain Hose
Sunroof Housing Drain Gutter
Sunroof Frame Bolts
Sunroof Window Guide
Sunroof Air Deflector Cover
Su ...
Installation Procedure
Create 6 x 20 mm (4/16 x 12/16 in) slots for MIG-brazing along the edges
of the rear inner wheelhouse as noted from the original
panel.
Note: If the location of the original plug weld holes can
not be determined, space the slots every 40 mm (1½ in).
Clean and prepare the ...
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 ...