but it also wouldn't be ideal to get a spacer like these CY craft Acrylic Shelf Dividers and find that they don't fit. Check the dimensions on the product description page before making your purchase.

Then, install the narrower crates, using ripped down wood spacers to fill the gap between the shelves and the supports. Finish by installing casters at the four corners of the shelving unit.

Spacers are inserted into the holes ... This 32-inch-wide stamped-steel shelving unit can be ordered to fit either the left or right side of the vehicle. Ours is being mounted on the street ...