Are you looking to fix yours or just get a brand new one to put in it? I think Standard Transmission and Blumenthal both have rebuilts to ship out immediately or they can rebuild yours. Either way, make sure you get the new main shaft and lock nut for the fifth gear fix or just get a 6 speed and a new clutch.
What excatly does " went out" mean?
Give me a few more details and I'll try to help.