Found this on a Vulcan Forum...maybe will help....good luck
There are a couple of hex head screws on the backside of the BAK that go through the filter opening and screw into the outer cover. One of them can be a bit of a pain to get out but if you reach the backside you will feel them.
Phil...(72)”Nobody told me I die at the end”
2006 (bought new)...1300R Candy Black Cherry,DARKSIDE,foots mod..