Radical Ducati = drool!
I was perusing some pics of Ducati Corse magnesium swingers and it appears they made a small and large axle mag hubs. Any part # hidden anywhere? I ask because almost always if it's an authentic Ducati Corse part it will have a stamped, white paint filled part # on it.
Interesting....you'll need to do some detective work...
more than likely the axle size (ID) will fit a normal axle but I seem to remember the OD (fitment to the swinger) was different on the mag swingarms and the mag hubs are usually made to fit the mag swingarms not the regular swingarms. so it may only fit into the appropriate mag swinger. can't help with exact measurements though, sorry. but don't be surprised if the OD doesn't match a standard hub.