I'm going to bump / comment on this post since the search feature for future users looking for 'Barkbuster' info will likely hit on it and I want to make sure there is not misinformation out there.
I also just completed an install of the BB, model BHG-152-00-NP, which is the basic handguards for 1 1/8" aluminum bars.
Here's the issue that
was trying to explain, but it is not BB's fault: Suzuki is misrepresenting the OEM bars on the XT model as 1 1/8" aluminum tapered bars. They are STEEL. Put a magnet on them and see.
Because steel bars have thinner walls than aluminum, and because the BB kit is designed for aluminum bars, there is basically a larger hole (for lack of a better description) that needs to be filled by the bar end mount. For that reason, the BB bar end mounts will not work. You can use Dwayne's suggestion of cannibalizing the OEM bar end hardware if you want, but there is an easier way. More on that below.
I also am of the impression that Dwayne may have ordered the 7/8" bar kit, or possibly reversed the inner mounts (they are side specific) because having to dremel the inner clamp mounts out makes no sense to me.
Anyway, the solution to the BB issue - if you have the STOCK 1 1/8" bars - is to place a piece of rubber hose over top of the assembly that goes into the bar ends. I used some scrap from a set of Tusk handguards that I installed on my dirt bike. Those bars are aluminum, and because the Tusk guards are set up for both steel and aluminum bars, they include these rubber sleeves to act as a spacer and to provide the correct diameter for the bar ends if you are mounting them in steel bars. By my best measurements, those rubber sleeves are pretty similar to 9/16" inner diameter rubber hose. So the solution is to get about 5 inches of 9/16" ID rubber hose, like a fuel line, or similar; and slide that over the bar end assembly before install.
Everything else bolts up just fine and there are no issues. I added a summary of the above on the Revzilla site under reviews for the BB to hopefully "alert" more people. It's a simple fix but if you don't have a good understanding of stuff you might be flummoxed and / or pissed off.
If there are questions please post up.
Pics of the install below... don't judge my:
a) lack of centerstand; it's supposedly en route
b) scarred up BB plastics... they have been on 3 different bikes now and I just keep reusing them...