NOS Ranco 91-12535 thermostat switch for the Thermo King AC system.
Check the photos for fitment to your model. This does not have a flat spot on the switch for the knob but a very specific stop blade. Look at the picture.

The 700 part number is Mercedes old system. They have been converted to 900 numbers.

Information as to what models this would work on is very difficult to obtain from the Classic center.