Hey W! If you are worried about having enough room with the BLM standard cell, you can always change the dimensions somewhat, making it taller or wider so it has the same capacity. Bill will make them up to suit. I am close enough to be able to ride to his place for custom fitting, I had mine made lower and sits deeper into the seat cavity than his previous models so I could get my leg over. If required maybe a FJR owner in Seattle can help on that. Anyway , the thing to do is make a cardboard mock up of his standard set up , see if that works, then modify it to suit, ending up with the best set up for you. My set up complete, cell, brackets, plumbing, with installation by Bill Mcavan was $1100. I made the cover myself, took a bajillion hours, but my time is worth nothing ha ha. A Linda Tanner cover, depending on pockets will add at lease $100 more. I have 11 gallons, that works fine for me, I usually fill up between 9 and 10. Others will surely differ, but my bladder capacity is what limits my stops. 11 gallons is OK by me, but I think less than 10.5 would be leaving too much on the table.