These are the distinctive press steel bevel cups, which are now very difficult to find and always seem to be missing when building up a new engine.
I have had these specially made and as always, original Norton items were used as patterns and these are identical in dimensions. They are very nicely made and supplied cadmium plated - although that should not be necessary if your oil supply is working properly!
These items fit between the bevel ball bearing and the large gland nut. They ensure the bearing does not go 'walkies' on its own