They are a sort of cup and cone system with 2x roller bearing races and 2x ball bearing races each side. I think but not sure that they fit 68 & 73mm frames due to the lock ring.
They should fit both, i've got one of the original needle roller/cup and cone ones and its been fitted to both a 68mm shell (what i originally fitted it to) and a 73mm shell (on the frame that followed it)
OK, so we all know that this system was flawed from the start
Really? My original XTR and my original DA adjustable bottom brackets are still perfectly serviceable. The XTR only got retired when i stopped racing and replaced my team bike (about 3 years ago) and had been ridden/raced for going on 15 years! The D-A is still in my cross bike, and of similar vintage, having done several years in my race bikes, then 3 years on my wifes race bike, went back on the crosser 2 or 3 years ago.........
It made a lovely change to the various square tapers i was using before, which lasted, at most, 18 months.