Where to find tub size for custom rack

I built a rack a few months back, and not thinking I used 2 different size tubs. I was wondering if anyone knows where to find a tub that is 20-24 inches long, around 18 inches wide and 7 inches high? I have been looking everywhere but can't find one. Thanks!!!

Take it apart and redo the height spacing for a new tub.

Quote:

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Originally Posted by RichsBallPythons

Take it apart and redo the height spacing for a new tub.

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2nd that. You should have built the rack fit to the tubs you were going to use. GL

Ok thanks I figured I would have too. It is two different sizes one for babies and adults just should have matched them in height.