WARNING: This page is about a different car, the 2015 Chevrolet Trax and 2015 Buick Encore. 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 COMPANY
Remove the upper starter bolt (2) and if equipped the washer (1).
Remove the lower starter bolt stud (3) and if equipped the washer.