If you are interested Electra Graphics do vinyl overlays for those wagons,
Will add a link
http://www.electrarailwaygraphics.co.uk/
Once the link opens click 'latest news' and it has them second picture down, for some reason the link wount take you straight there I have tried a few different links sorry.
Thanks,
Tom
EDIT SORRY LINK IS FOR N GAUGE STOCK NOT 00 SORRY