2003 GMC Sierra 1500 Pickup Owner's Manual - Page 465

L The tools you'll be using include the bottle jack (A), the wheel blocks (B), the jack handle (C), the jack handle extensions (D), and the wheel wrench (E). If the flat tire is on the rear of the vehicle, you'll need to use both jack handle extensions. Attach the wheel wrench to the jack handle extensions (as needed). Attach the jack handle to the jack. 5-90