CB UJs (four-cylinder and V8) are about 3" between the clamp-bolt centres, RB (again both) are about 2.5". CB originally had replaceable spiders and cups, with RB a one-piece unit, but most suppliers now show the CB item as a one piece with the same part number as previously - AHH6000:
CB above is almost entirely external to the bulkhead, RB below recessed by half its length:
Shown installed here, but to replace the CB spider and bearings remove the circlip and strike it at the indicated point, holding the UJ in the other hand, to knock the cup closest to you out a bit at a time. Using grips to twist it out the rest of the way, and maybe having to use double sockets to push it out that far, can be difficult. Don't strike it near the edges of the hole the cup sits in as you could distort it making them even tighter:
Undersized nipple in the UJ (screw this into the spider before fitting the yokes):
Undersized (top) and standard (bottom) nipples, with a drilled adapter stud screwed in to the latter:
Adapter screwed into the nipple body on the UJ. No ball and spring seal on this as it is only fitted for greasing, the undersized nipple is refitted for normal use
This is a real odd-ball from the owner of a 65 in Poland in 2017. All the UJs I have seen have had the centre of the spider mid-way between the two clamp bolts so it can be fitted either way round, but this one has it offset, so much so that it looks like it has been assembled from one CB yoke and one RB, or is for a completely different vehicle. This will put the steering column in a different position relative to the driver, and depending on which way round it is fitted will have a massive effect on UJ alignment:
