Transmission Rebuild

I'm currently rebuilding the transmission out of one of my Mazda's I have gotten a lot off stuff off and its been going smooth until I took 5th gear off and I encountered a 41mm nut that's a good 2 feet on the tailshaft. Anyone know how to find the specialty tools for these transmissions? Or will I just have to make a tool? Any info on this is much appreciated. and is there any other roadblocks that I'm going to hit when taking the gear cluster apart off the main shaft?