The special nut is listed as 14002811 and the screw listed as M4.2 x 1.4 x 20 part number either 11504477 or 11504659. You should be able to chase the screws down at a decent hardware store. McMaster-Carr maybe. Good luck and let me know if you need more part numbers to help!
KenView attachment 141774View attachment 141775
Chrome ones
https://rover.ebay.com/rover/1/711-...0001&campid=5335822911&icep_item=392000367485
Black Oxide ones. Apparently either is standard screw thread.
Well nut:
https://rover.ebay.com/rover/1/711-...0001&campid=5335822911&icep_item=283795843652
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