Thought I would follow up with this thread to say that I have found out what original toggle switches these Cats use since I couldn't find info anywhere else about the brand or type of switch they use.
Apparently they use a switch with the brand name "Carlisle" which is coincidentially the same name brand of the tires they used. I wonder if they were the same company?
It is a one-wire, self-grounding toggle switch like was mentioned above. I managed to pick up an NOS switch plate with a brand new Carlisle toggle switch on it and I will post pictures of it here for reference, for anyone that could use the pictures for restoring their Cat. I also picked up a smaller switch plate with a switch and it used the Carlisle brand as well, so maybe all Cats used the same brand switch.
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