Does anyone know about rx7 gearboxes?
 

I need to figure this out. Is the input shaft a different length on an rx7 transmission?

I want to say it sticks past the bell housing, while a 1.6l 5spd does not. I only know because I couldn't stand the t2 transmission on end due to shaft length, and the 5spd sits like that fine.

yeah, but the bellhousings are different. the miata one could just be longer.

And i no longer have all the components to measure... sry.

I managed to find some details on it, so i'll post for posterity:
http://myweb.cableone.net/currie/tom/RX7/input.JPG
miata is on the right

find crash's website it covers everything you need for the swap.
well his site seems to be down but drop him a pm and maybe he will be off help to you.
http://forum.miata.net/vb/member.php?u=3476