I have this item availible, Thought I would offer it on here first.
It has the top missing and the two nuts (the one on there was just to test the threads which are ok)
I think someone here make new resin parts to replace the top ?
Ref 6D/223 Mk VIII*
Condition as in picture.
Also have a Connector
Ref 6D/526 Mk IV
Will Swap for Hurricane Cockpit items.
If not will list on 'That' site.