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 WarningDeployment Outside Vehicle - Steering Wheel Module, Instrument Panel
Module, and Roof Rail Module
Deploy the inflator module outside of the vehicle when the vehicle will be
returned to service. Situations that require deployment outside
of the vehicle include the following:
Using the SIR diagnostics, you determine that the inflator module is
malfunctioning
The inflator module is cosm ...
Installation Procedure
Create 5 x 18 mm (4/16 x 11/16 in) slots for MIG-brazing along the edges
of the tail lamp pocket as noted f rom the
original panel.
Note:
Clean and prepare the attaching surfaces for brazing.
Position the tail lamp pocket on the vehicle.
Verify the fit of the ta ...
Specifications
Front Door (Diesel)
65 mm
83 mm
Front Door (Diesel)
60 mm
87 mm
Rear Compartment Lid (Diesel)
122 mm
32 mm
Rear Compartment Lid (Ecoline)
162 mm
32 mm
...