Good question Win, thats what Im trying to find out. Peter from Hanny's told me that it should bolt straight on, however he wasn't 100% on the difference in diameter of the two throttle bodies, he thought the B16A could be around 60mm-62mm . We measured the D16 TB, and as mentioned above it was 58mm.
Thanks guys for your help I may attempt to change the TB.
By the way has anyone done this before or heard of someone that has? :D