Michael,
The picture on their website shows the carbs are pretty far back. In fact, it appears that the top of the carb is touching the frame gusset. I don't think this is going to be a very satisfactory bolt-on. You probably would need to cut away part of the gusset. I know Kenny Dreer was using these on his VR880 rebuilds also.
I just put a set of 41 mm FCR's on my Ducati and I can't wait for the weather to break so I can try them out.