Hello Tony,
In addition to Stevey Y’s advice:-
Keep searching EBay - both U.K. and particularly Continent.
Pay a visit to Smiths, and make a note of all relevant classic car publications, and place wanted ads in all of those.
Register your ‘want’ on on-line breaker links such as Partsfinder (there are more). Long shot, but everything is.
Do a Google search for Classic car panels, and you should also come up with specialist panel repairers.
Not wanting to frighten you, but for wings, and particularly repairing panels, your wallet is likely to be offended.
Good luck with your searches.
Perhaps you could let us know how you get on.
Kind regards,
Gareth.