Take a tape measure with you when you go to look at it. Or better yet, a carboy with bung and airlock (have a blowoff tube assembly waiting in the wings too) so that you can dry fit it. You have the best chance with one that doesn't have a hump, which could be a challenge.
Typically the larger, small, fridges don't have the hump, or it's smaller... Which could be why Zman picked the 5.2 cu. ft. model.
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