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I will look to see if I can find a replacement thermostat only for that unit and get back to you.
Here is a link to the parts that you need. Look at page two to see your heater, then you will see the replacement Hi-Limit sensor and Thermostat, just replace the thermostat if the heater is good. 9523-11 is the Thermostat # ***** 9523-12 is the Hi-Limit.
You can just replace the thermostat on the old element. The heater element,thermostat and high-limit are three separate units.
It is always recommended to replace parts with exact replacements when available as some parts will not work with others.
Here is a link for the thermostat https://optimusparts.com/products/item/6143f46e-2e6a-4477-a02a-afc0312e6ff9
Here is the High Limit https://optimusparts.com/products/item/b1a2b9aa-4865-484c-911d-65549a82ecdc
You can buy them separately and replace the bad ones.
The only things inside that heater housing are these two parts the heater and thermostat knob, with wiring.
Try this one
And here is thermostat
The main thing to note when it comes to thermostats is the capillary length and width. The capillary is the end of the copper probe if it is the same diameter and length then you are fine. If you buy the complete heater everything will be new. Just a thought.
It has been so long since I had to rewire one of these I do not know if I can remember. Send me a picture of the inside of the grey box so I can see what you see.