I've just gathered a load of parts required to rebuild another box, (because I enjoy doing them).
All baulk rings, all needle rollers bearings and their bushes, all the spacers, all the shifting inserts and springs.
Mainshaft and countershaft locking nuts
Front cover gasket, and front and rear oil seals.
Countershaft front and rear bearings (front bearing is Nissan only, all others in the box available from any bearing supplier, so I got them elsewhere)
These are all genuine Nissan OEM parts, which I got off the net from
www.partsouq.com who are in UAE.
The cost and shipping time was the best part, £363 shipped to my door, in 4 days from ordering. Import fees on top was around £70, but I was seriously impressed.
As for the Kenjutsu kit, just be sure that it has the correct three piece 2nd and 3rd gear synchros, as the image on the link only shows one 3pc set. Some earlier boxes had just one 3pc set, but I've not seen one yet.
If you only do the bearings, I can get you the bearing numbers required, except the Nissan only one.