I've got mine installed on my Tiger 800 XC with Barkbuster's fitted. The unit fit right over the Barkbuster spacer as they are both 7/8". The challenge for me was to keep the helmet hook in place. You can see in the first photo, I used a gromet I had laying around - this helped, but I'm in search of a piece of 3/4 - 7/8 ID hose that I can cut to fit the space and give the helmet hook a little resistance.
In the 2nd and 3rd photo - here it is "stowed" and "deployed". I've drilled a hole for the lock and need to go get one.