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50g is probably the closest in width and height...fishguy provided the dimensions ^. My LFS says they don't make 50g with those dimensions anymore but I'm not sure how much truth is in that. You might could find one used. I'd love to have that size!
Check out the website glasscages.com They have a big selection of both glass and acrylic tanks in all sizes. If the size is not in stock then they can make it to your specifications.