Those are some good looking gears, here's what I found from searching this forum, I hope it helps, maybe you can add some new information/sources to it.
It would help if someone could post a schematic of all the parts and part numbers and part name. When you view the schematic, you need to know that part # 2038 and part number 1342 are reversed and in the wrong place. Hope you got the thrust washer 2038 if not I've posted the dimensions before on this forum. I rebuilt mine 5 yrs ago, most likely only the top shaft bearings have wear on them. Bearing #1342 I bought on ebay # 6210 with no seals cost $13.00. Bearing #1339 bought on ebay #6307rs, it has 2 seals remove only the one on inside of transmission.
good luck, carry on nick c