One thing I did find during my search for a replacement was that almost all of the countertop models cannot be safely built into a cabinet, as there is no way to vent the heat out of the cabinet.
I finally found a "Mauve" brand that is used in the marine industry, that fit, and is approved for in cabinet installation.
More information can be found at
http://rvbuildernews.com/mauve-micro...-oem-builders/
We like ours even better than the Sharp convection/microwave that we had...
For whatever it's worth..
Larry