Were you looking for a residential fridge? We have the 9 C.F. Dometic RV unit in our 360 and it takes a good bit of space. Short of removing the pantry and moving the stove down, I am not sure how you could get a residential unit in that foot print.
I have seen Dometic and Nordic over the years advertise that they can get more cooling space in the same footprint. You might be able to take your current model number to them and see if they have an upgrade for the same footprint.
This is the unit in our 360:
http://www.campingworld.com/dometic-...-door-90-cu-ft
Overall Dimensions: 63 15/16"H X 25 5/64"W X 26 1/16"D
Enclosure Dimensions: 62 61/64"H X 23 11/16"W X 24"D