Hi,
A favour please? I have just got a pair of wheels with Hope hubs and the rear has the same disc fitting as yours but came without the silver locking ring. Could you look and see if the ring has a part number on it so I can try to find one from Hope or second hand? I can't seem to find a parts diagram on the Hope website that shows this type of fixing.
Good luck with the sale.
Cheers, James.