From my research it looks like what you have right now is a High Pointe microwave that has overall dimensions of 20.5" W x 13.19" H x 20.4" depth, has an output of 1,000 watts and a 1.1 cubic feet oven capacity.
The recommended replacement, the High Pointe RV Convection Microwave # HP49ZR has overall dimensions of 20-1/2" wide x 14-3/4" tall x 18-11/16" deep, an output of 1,000 watts, and the same 1.1 cubic feet oven capacity, making the replacement only 1.5" taller and 1.71" less deep... view full answer...