judging from your previos post above, I have a couple of questions:
Is the mtx75 casing that BADLY damaged that they can't use it? If they can't, contact terry haines, I'm sure he might be able to help you out and hook you up with a tranny. Junkyard is always an option.
In terms of rebuild, you'll have to shell out $1000 for parts and labor on a used tranny. If they can salvage yours (I don't know how bad your diff exploded), then you can get teh upgraded synchros, a Quaife or Torsen diff, and new clutch, flywheel, shift forks from the focus and you're GOOD TO GO.