Erich, ebay seems to refer to this sort of thing as an anchor nut. 2BA crop up from time to time but there are others out there at present. Maybe worth a search? These people, for example, call them Nut Plates.
http://www.nutplates.com/
Regards,
Stuart
Also, these intrigued me
https://www.extensivepivot.top/nos-2ba-b...p-354.html
Regards, Stuart
http://www.nutplates.com/
Regards,
Stuart
Also, these intrigued me
https://www.extensivepivot.top/nos-2ba-b...p-354.html
Regards, Stuart