WARNING: This page is about a different car, the 2005 Buick LeSabre. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: View Of Headlamp/Fascia Panel And Radiator Support Brackets
Courtesy of GENERAL MOTORS CORP.
Open the hood.
Remove the Radiator support bracket fasteners.
Remove the Radiator support brackets (4) from the vehicle.