Hmm, downshift1 what do you want for yours? A good one runs around $1200, I was told by Rallispec not to pay more then $600 for one that is broken with bad gears, since yours is also missing the front diff I would want to pay a little less then $600 for it. If that is not what you are looking for let me know and I will see what I can do?
Ops never mind of the front, I would need a center, may just have to buy an STi center from RalliSpec.