Hello Karen,
A couple of possible pointers for you (apologies if you have already been there):-
Try registering your 'wants' with the secondhand car parts search companies with which scrap yards, nationally, link into . Any holding the parts you want will then contact you. One is Partsgateway or Partsfinder ( or similar) I think, but you will find more on a search.
Tried good old E.Bay?
I think you will have to expand your search to the correct panels in any colour. Obtaining the correct colour is likely to be very much of a long shot, and even if you do, you will inevitably find the panels will have storage marks and will need to be refinished anyway.
Good luck and kind regsrds,
Gareth.