Pays to go back and read books you haven't looked at in a long time.
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Found an explanation why the front & rear turrets were changed.
So this became the beginning of the KI-67Ia. Model.
![](http://i1002.photobucket.com/albums/af142/barneybolac/Mitsubishi%20KI-67/img016_zpshhnbjque.jpg)
So when they changed out all the 7.9mm guns to 12.7mm and added the extra 12.7mm to the rear turret then this became the KI-67Ib. Model.
![](http://i1002.photobucket.com/albums/af142/barneybolac/Mitsubishi%20KI-67/img019_zps5m06zjim.jpg)
This part I did not know though at some point the 20mm cannon in the dorsal turret on the KI-67Ib was changed out for 2 x 12.7mm's. Clearly this must have been a better option than the 20mm cannon?
![](http://i1002.photobucket.com/albums/af142/barneybolac/Mitsubishi%20KI-67/img017_zpsvmjuuwr5.jpg)
Also the only model to carry torpedoes was the KI-67Ia yet it only had a single 12.7mm gun in the tail.
AHIII KI-67 has torpedoes as well as the twin 12.7mm guns in the tail. Yet no KI-67Ia variant had the twin guns in the rear turret only the KI-67Ib.
So it looks as if we have a bit of a hybrid in game.
![](http://i1002.photobucket.com/albums/af142/barneybolac/Mitsubishi%20KI-67/img018_zpsqnocjyjh.jpg)