Not sure if you want this but I can offer it as I just had a 555 main shaft repaired. They put a proper Rockwell hardness sleeve on and machine down to specs. I can also get bearing kits with the shift fork pads.
I have to drive 2 hours each way so if you want this done, turn around is 1-2 weeks.
Prices start at $150 for the shaft repairs and $200 for the bearing kits, $300 with synchro rings. 523/568/543 kits with synchro's are around $400.