Hi,
I can give you the right dimensions of a P-51 D. The info comes from the book WW-2 Airplanes (olso info for the P-38,B-17,Hellcat,F4U,Spitfire,Mosquito,Lancaster,Bf 109,Fw 190,Ju 87 and Zero )
Span:37 ft5/16 in(11,28 m)
wing area:240,06sc.ft. (22,13 sc m. )
i hope this info helps you somewhat.
Greeting,