Supah, checked with my 4th FG friend--you're right for the reason behind the lack of wire antenna on ETO P-51s.
IMHO Cripes is right on the different canopy shapes on Dallas-built aircraft, especially the 1500 K models. My references say that 84 or so were given to the Austrailian AF, and Grubby's photo might be one. Last question for my education: were all P-51s built by Dallas (Ds and Ks) equipped with the different canopy?
Here's a bit from my files that addresses the different canopy shape lines. I presume that many of those K models were used in the war??
Thanks!