What brand batwing do you have? Is it just a batwing without mounting hardware?
My understanding is the 1800's need a fork mount (clamps), unless you move your indicators (since they are fork mounted between the triple trees).
If I had an 1800, I would move the indicators down below the triple trees, and find a triple tree mount for the batwing. I think triple tree mounts are superior to fork mounted. For example, I have angle adjustment with my mount, while fork mounted limits your angle adjustment ability.