As a last resort if you cannot find the correct part: I used a regular refrigerator thermostat and control knob. I just spliced it into the wires and control unit on my Dometic and it has worked fine for 6-7 yrs now.
I think it is a freezer thermostat and not the lower unit thermostat but it works so I have not tried to switch it out for a different unit. The only issue I have is on the dial it will freeze the top shelf at the 3 setting and the whole frig becomes a freezer if it is turned up to 5 on a 1-9 scale.
