These RESCUED threaded nuts come from 1970s Airstreams. Threads are in very good condition but may have some cosmetic flaws.
They are used to retain the push arms in the triangular brackets on the left and right sides of the sashes of 1972+ Airstreams. 1969-1971 Airstreams used a press-on but instead of these.
Very limited supply.
Old Airstream PN 683934