WARNING: This page is about a different car, the 2011 Chevrolet Cruze. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Starter, Bolt, Stud And Washer
Courtesy of GENERAL MOTORS CORP.
Remove the upper starter bolt (2) and the washer (1).
Remove the lower starter bolt stud (3) and the washer.