I forgot:
An option, if you can't find the decals commercially or in the right scale is to have custom decals made. I used Mike Grant at www.mikegrantdesign.com. He can work off photos, custom art work, etc. He did a beautiful job on my uncle's B-24, The Chambermaid.
Another option, if you can find the decals, but just not in the correct scale, is to scan them, blow them up or reduce them to the desired scale and print them on laser decal paper. Try www.beldecal.com or tangopappadecals.com. for laser paper. I tried the inkjet papers and could not get them to work. The laser paper is pretty slick. Only hitch is you need access to a color laser printer or a Kinko's, etc. that will do the copying. I've heard some of the walk-in printers won't work with decal paper?
Hope this helps.