WARNING: This page is about a different car, the 2003 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.
Remove the roof lift off panel.
Fig 1: Roof Lift Off Panel
Courtesy of GENERAL MOTORS CORP.
Remove the roof panel rear locator pin from the roof panel.
Fig 2: Roof Panel Rear Locator Pin From Roof Panel