help to identify mustang

Hello I recently purchased a fixer upper cox p-51 bubble canopy mustang . it seems to be a nice unused plane but was painted blue at some point,no big deal I stripped it and under the paint was a nicely preserved dark green mustang ,the only origional markings is the rudder being painted yellow with a large # 7 on it ,and there are small patches painted yellow on the leading edges of the wings to represent the cannons , the yellow paint appears to be origional and was under the blue paint . I have checked all the pictures I can find and the only mustang I can find with a yellow rudder is the silver invasion mustang ??? I am trying to figure out what the proper decals are for this plane . cilinder to the side on this version. thanks for any help, cheers Roger