Maybe try finding some risers from a 750 Shadow Spirit?
I had the Keystone's on my ACE 1100 for a bit and found them a bit sketchy for handling. I believe they're only 28.5" wide. I've found anything less than 30" wide, and handling seemed to suffer. I guess it also depends how hard you ride too. That said, those bars look awesome! I was pretty sad to take them off. Ended up going with the Biltwell Tracker bars after.