Hi Stefaan,
If you get the following Web Site it will give you all the information on 500 Sqdn. (it does not however, give you the colour schemes for the Sqdn's Balitimores.
But if you click on "contact me" section I am sure the organiser will be able to assist you as he has helped me greatly in the past.
The web site is "Air of Authority" (
http://www.rafweb.org/Index.htm)
Good luck with your search.
dakota