Uxcell 10 Pcs Stainless Steel Spacer 5/16" Bore x 5/8" OD x 3/8"

If you use these Husky workstations like I do, swapping the two stationary wheels for swivel casters makes them SO much easier to move around the shop. The problem is the replacement casters I used were shorter than the factory wheels, so the toolbox wouldn’t sit level.
 
I used these stainless-steel spacers between the toolbox and the new casters to make up the height difference. Because the spacers add thickness, I also needed longer M8 x 30mm bolts to mount everything securely.
 
With four swivel casters, I can move the workstation in any direction instead of constantly maneuvering around the two fixed wheels.
 
I have the exact longer bolts I used listed on the site as well if you’re doing the same modification.