I'm not sure which microwave model you have, however, the smaller unit is almost impossible to find a replacement for due to the cabinet size being so small. We looked forever to find a replacement for the one in our Wildcat MAXX and finally gave up due to all the replacement units we found would not fit in the cabinet. Hope, in spite of our experience, you find something that will work for you! Good luck.
Days camping (2016)----181 days
Days camping (2017) --- 82 days
2016 Wildcat MAXX 28RKX (33' TT), 2007 13' Scamp
2015 Ram Laramie Hemi, w/air suspension
30 years RV'ing
11 different RV's