They're supposed to be the same housing. with thinner gears to allow for the space for 6 of them. [the rumor why they're weaker.] so it should fit.
Im going to be using one, but i havent got it into the tunnel yet though.
good luck, any progress you make would help me as well.
another thing. the 6th gear isnt a super overdrive like on a t56, so its just a closer ration box. its allright with me, i like shifting, but i thought you should know.