Neumann NS Connectors

I am fortunate to have the use of a large selection of vintage Neumann Gefell microphones. Sadly though the old NS80 and such, connectors on these mics are faltering. So I put it out to the forum. Please any sources for NOS on these? I know they can be replaced with newer different solutions but I would like this to be a last resort as a nod to retaining there wholeness.

Pip

http://recordinghacks.com/pdf/gefell/historymicrotechgefell.pdf