The bandits of Bridgewater will almost certainly have them. There is a dutch site that I have used for Shimano IGH bits that might have them as well. Both tend to be pricey on carriage, SJS might be a better bet these days on small parcels. I currently have a rh nut on the lh of my AW3 due to thread failure. Be careful with the drop-out lock washers, I am sure that a part of my failure was due to a bit of movement which made the lh side nut work a bit harder than necessary