Buick LaCrosse Owner's Manual page 340

3. Turn the wing nut
counterclockwise to remove it.
4. Remove the tire sealant and
compressor kit.
To store the tire sealant and
compressor kit, reverse the steps.
The equipment you need is located
in the trunk.
1. Open the trunk.
2. Remove the spare tire cover.
3. Turn the retainer nut
counterclockwise and remove
the spare tire.
4. Place the spare tire next to the
tire being changed.