I have a question. Does anyone know of a cross reference of RAF serials of lend lease aircraft (in this case KM272) with US serials? I'm trying to determine what production block "Dooleybird" was (-20, -25, -30)?. This will help determine if the wheel wells should be YZC or not as, apparently, Dallas built P-51's from the -20 block onwards started to see a lot of YZC on interior surfaces.