Here is a replacement for the Sharp Carousel convection microwave R1850 model. The direct replacement available that I found was the Sharp R1874, only difference is that its stainless steel instead of black plastic. This application was in a 1998 Fleetwood American Eagle, and the mounting needed to be the exact same as this does not hang from a cabinet like most over the counter microwaves, it hangs from the back plate via some hanging screws.