After a long search, I have finally found an FSBE II baton pouch.
It just a silly, little pouch to, well, hold a collapsible baton. Nothing more or less than that.
The reason I wanted it, is because it is so rare. I have personally only ever seen one for sale. So when this popped up, I had to have it.
I have put it up on my MBSS, but this is only a temporary configuration, till I figure out how I really want to set it up.