Obviously after 30 years the retainers were all rusted solid and needed hacking off which brings me, finally, to my question.
I want to know the part number for the 6mm clipnut, chimney nut, unut, captive nut or whatever they are called
they look like this

The part number on ETOS is N90168602 but I think it has been replaced by a different part number. Can anyone tell me what it is please?