GMC 2001 C3 Owner's Manual page 265

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 a rear tire of the vehicle, you'll need
to use both jack handle extensions.
5-22
Attach the wheel wrench to the jack handle extensions
(as needed). Attach the jack handle to the jack.