For our 21VD (which should be the same as a 20J), the refrigerator cabinet size is supposed to be (according to the refrigerator installation instructions): 23.31" wide, 59.85" high and 24" deep.
This information is from the Norcold's website for an N10DC refrigerator.
Our 21VD is in storage, so I can't measure the actual dimensions.
If you can find the model # for your current refrigerator, you should be able to find the installation instructions - compare that to the instructions for any replacements you are considering.
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