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Searched on your posted part numbers. The onan didn't get me much. The INDEX 8037122 number has more info available.
https://www.ebay.com/itm/INDEX-Thermostatic-Switch-8037122-5-8-Fine-Thread-225-Degree-Normally-Open-/252688737382
Then did a reverse search on the NSN 5930-01-378-6882 in TM...
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