The throwout bearing sits in the back of the gearbox, where it is normally held in place by the clutch arm assembly. My model /5 has the ball bearing type, as pictured. Some later ones had "needles" instead of the ball bearings. Moving the gearbox around the shop during disassembly, I've been careful not to lose this piece, as it drops out fairly easily once the clutch assembly is removed.
On reassembly, the throwout bearing should be lubed with non-moly NLG1-2 grease, the same stuff you use for other bearings (fork, wheel, etc.) After lubing, insert the bearing back in, then put a drop of regular moly grease on the tip of the clutch rod (you can see the rod sticking partly out in the center of the photo). Then you're ready to reassemble the clutch arm parts.
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