Microwave convection shot. Replacement?

Our Dometic microwave convection died. It was a DOTRC17B. 2007 vintage. The fuse is good. It's actually an LG. I'd like to get a new LG to fit the mounts but I do not know the models that replace the size and back mount. Has anyone done this? Other models would be worth a try but I am leery of trusting the mounting given the state of the highways these days. Any info would be helpful
Thanks