For the lensboards (yes, it should take the Linhof/Wista boards, IIRC), try Badger Graphic - they usually have name brand and knockoffs in stock. I'd also call them and ask about the shutters. If memory serves I read something recently that Copal had quit making shutters, so they may not be available new for much longer. I'd try them and the View Camera Store in Arizona.

http://www.badgergraphic.com/

http://www.viewcamerastore.com/