Hey Warbird51!
You're pretty sharp! Not many P-51A officianados know that. You're correct...the full scale "Polar Bear" is a conglomerate of "A","B", and "D" parts. (As a P-51 officianado you know the only difference between the "B" and "C" variants were their place of manufacture.) To really get an A+, can you tell us some of the most significant differences between the "A" and "B" variants?

I love to learn...keeps me humble.