I think I mentioned this in your other "Duc" thread but I would try Hall's cycle. They were excellent with the sometimes obscure Husky parts I needed for my '91 610wxe "ice bike." 2 day service. They have a great parts list and pricing "lookup" feature online. Ducati Seattle and BCM in New Hampshire have also been good for OEM stuff.
Aftermarket Chris at California Cycle Works is a very knowledgeable Duc afficianado. He has some excellent instructional vids on his site.
LT Snyder at Desmo Times has been wrenching on Ducs for a long time too. He's put together "workshop manuals" that cover the common 2 valve maintenance operations that's well worth the price. He also offers many "special tools" at more reasonable rates that the official Duc ones. In some cases they are also better designs. There's a Hyper and Multistrada specific forum at Desmo Times. LT Snyder contributes there.
I think that Duc's got a hold of you...