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.
'13 Triumph Tiger 800 XC
'06 'Berg FE450E
'01 Honda XR400 (for sale
'07 KTM 990 Adventure (gone), '08 Ducati 848 (RIP), '08 Hypermotard 1100 (gone), '86 Yamaha YX600 Radian (gone)