Hummer 2003 H2 Owner's Manual page 323

The spare tire and wheel blocks are stored in the rear
cargo area. Remove the tire cover to get to them.
A. Spare Tire
B. Receiver Extension (If Equipped) (Not used for tire
changing procedure. See "Receiver Extension" in
the Index.)
C. Tire Retainer Plate
D. Nut
E. Wheel Blocks
Follow these instructions to remove the wheel blocks
and spare tire:
1. Remove the wheel blocks from the tire retainer plate
by turning the wingnut counterclockwise.
2. Place the flat end of the wheel wrench through the
hole in the spanner wrench.
5-21