Out of curiosity, I rebuilt a couple of OEM shifter u-joints. This was the subject of a POCA Newsletter article a few years back. They are not really designed for this, but the bearings are available, and you can add o-rings to new bearings for dirt seals. The OEMs do not have seals.
But the bearings are only held by press fit and its possible to enlarge the holes in the body during rework, such that the bearings will walk back out in heavy use. I used red Lock-tite on the second one. All in all, it's not worth the effort when there are better units readily available.