A833 Rear 207 bearing

That snapring is A833 specific, and it does NOT go on the bearing at all. Rather is goes in the housing, and so, it's tensioned in the outwards direction.
The usual way to install it, is to put it on the mainshaft before the rear bearing goes on. Then capture the ends together with a home-made tool, slide the whole works in, then position the snapring in the housing, and release the ends. Then, finally, you have to prove the snapring is actually seated, and there is as good as no endplay of the bearing in the housing.
IIRC the snaprings in the automatics are Not thick enough to prevent the bearing from walking around in the housing. If the bearing moves, so will the Mainshaft, and everything on it. And so, since the forks do not move along with it, you may have shifting difficulties.
So then, whatever you install, just make sure the bearing is properly located with little to no endplay.

BTW
before you install the loaded mainshaft, make sure the metal baffle is in there, under the vent.