Google Stricks Cycle here in Asheville. Gene or Mary can give you tons of references. They HAVE tons of parts. They're going out of business soon, so don't waste time.
Also, Stuart Hall at City Foreign has contacts for that stuff. Give him a call at 828- 252- 7321
He has a recently restored Triumph that's not hard to start. Also has BSAs, Velocette, Indian, Ducati- he;s got real tasty stuff, and he does the work in the back of his auto parts store.