I've also tried to look for the CV joints alone (because replacing those is a fair option) but again the problem seems to be the inner tripod joint (gearbox side). The separate "joint" being sold seems to comprise of the shaft that comes with the tripod cup only (no tripod with new rollers) and on each one I've seen the other end of the shaft, again, looks like the one for the manual transmission. So what the heck is it about the scarcity of shaft ends that fit the AM6 splines?

Buying a used low-mileage one is the last option but there's the element of hit-or-miss, obviously.