I'll just add that if you go to a junkyard, check the Dodge vans and campers. Seems they used many 1960's parts into the late 1980's, probably using up surplus stock. I have found some connectors interchange w/ my 1965's. I pulled a steering wheel from a late-80's camper and it fit my 65 Dart, so sure the nut would too. I probably tossed the nut in my bucket, but too hard to search for it years later.