 The basic dimensions of the P-51/A-36 variants remained consistent from the XP-51 through to the experimental "lightweight" P-51s, although there were relatively minor variations in height and wing area.The P-51H was the first production version of the Mustang to feature a lengthened fuselage and taller tailfin.The power rating for the engines could vary according to the type of supercharger fitted, the size of the compressor impeller(s), and the gear speeds selected.