Your big problem is they are out of production.
The second problem is without a number you can't find them online.
Most likely they are clear view storage, unfortunately Sterilite ran two different model lines of similar sizes. Without a tag its impossible to say if that is in fact a 5 qt tub.
I would start with the 17XX series but the curvature of the top almost looks like that of the 19XX series, hard to say from the photo.
Is it a DIY rack? Otherwise many of the rack manufactures do in fact have spare tubs for sale, you just need to call.
Last option would be to have a plastic injection mold place do one off run...but this will be expensive.
I'm sorry to say but at some point you will have to move on to another tub. I prefer the Cambro tubs...
If it turns out to be a Sterilite 1952 send me a pm.
Cheers
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Jeremy Payne
JB Reptile
1.0 Snow "Kahl"
0.2 Triple Het Moonglow "Kahl"
0.1 Orange Tail Hypo Het Leopard
1.0 Ghost
0.1 DH Ghost
1.1 "Kahl" Albino
1.0.2 Hypomelenistic
1.3 Pastel Hypo
0.1 Anerthrystic
0.0.2 Normal
0.0.2 Morelia Viridis
1.1 Morelia Clastolepis