I just went through this and darn near drove myself nuts trying to find a replacement for our burned out Sharp R-1874. I didn't want another Sharp due to the poor reputation of this particular unit. Unfortunately, I could not find a replacement for it that would properly mount without doing major modifications to the cabinetry. We tried LG, GE and Kenmore to no avail. In the end we wound up with another Sharp R-1874 and cross our fingers every time we use it.
Craig & Donna
2005 Beaver Monterey Laguna IV (aka The Hotel Monterey)
2011 Jeep Liberty Limited