if your talking about a fork clamp, like for the goldwing, no one makes one for the valk.
someone does (or did) my bro has one on his valk. because of the inverted forks i don't see that the clamp does a thing for his valk. but if you really want one, go to the book and look at one for a vtx 1800 - same front end i believe. but terry says he feels zero difference with the clamp. made a world of difference on a goldwing, but they have conventianal forks.