It's an aluminum box with a small printed circuit boad inside preheat module
No other part numbers with same form, fit, and function found.
Classification: Parts and accessories of articles of schedule b subheading 9030.39
NSN 6620-01-258-8980
NSN 5998-01-240-9352
NSN 5910-01-607-0879
NSN 6135-00-452-2266
NSN 6650-00-054-4721
NSN 6610-01-419-7130
NSN 5920-00-116-4959
NSN 6105-01-043-2097
NSN 5920-01-358-6930
NSN 7035-01-265-0216
NSN 5985-01-227-5748
NSN 5998-01-364-0960