Starting to assemble bike after the "clutch" thing.

This part is similar to the shim at the bottom radiator mount.

Any ideas??

That's easy. It's the metal button that goes in the tank fairing right behind the steering stem nut. There is supposed to be a hex key cap screw that goes through the button to hold the tank fairing down. No plastic washer with that one

Thanks, Rook. That's what it is.