new rack built, now I need tub help...

[AJs Snake House]

So I bought the "skinny" billy bookshelf from Ikea to build a hatchling rack for eight 5 or 6 qt tubs. I finish building it, (Actually my husband did ) but the tubs are a teeny bit two wide to fit side by side and too long to fit without lids. So instead of 4 shelves with two tubs each, It's one tub sideways and pushed all the way back to rest next to the flexwatt. Does anyone know of any other brand of tubs that are square instead of rectangle or that will fit in these dimensions....
The tubs that I bought are sterilite 6 qt with the white lids (non-locking as I built shelves to make the tubs to fit with no lids)

http://www.ikea.com/us/en/catalog/products/80085707/

Product dimensions
Width: 15 3/4 "
Depth: 11 "
Height: 41 3/4 "
Max load/shelf: 33 lb

Width: 40 cm
Depth: 28 cm
Height: 106 cm
Max load/shelf: 15 kg

got my idea from this, i wish I knew where he got his tubs
http://www.reptileforums.co.uk/forum...y-pleased.html