There were two versions of the trainer, one with the A6M2 model 21 wing and
engine, the other with the A6M5 wing but still the type 21 engine. This
model is the latter type. As you can see in this
photo with both models facing each other, the A6M2-K had a longer forward
fuselage ahead of the wing, and a longer tail wheel, both to accommodate the
back seat where the instructor was.
Those changes re-balanced the airplane and improved what little forward
vision there was from the rear seat.
