Maybe I'm not understanding which part you're referring to. I've seen steering shafts that have worn at that u-joint at the top of your image, and the solution was to just replace that black painted assembly, which is what RA listed as the lower intermediate shaft. The bearings were sealed in. You wouldn't be replacing the entire steering shaft, just that lower section. I'll have to go dig up a different parts breakdown than I have at hand to see if there's another bearing listed in that area. I don't see another one at that area in the diagram I have currently.
In the manuals, there's a whole section on looseness in the steering column. It goes through replacing the upper/lower shafts as one source of looseness, but I can't find anything that gets as granular as replacing the u-joint bearings.
...EDIT... I obviously can't read diagrams properly anymore. That image was taken aiming up, so that's the upper intermediate shaft. My perspective was inverted. I'm still not finding a separate bearing listing, but hopefully one of the more machinist oriented members can share some ideas.
Cheers-
Chris