The only one i know of is AdvTank's Rally tank which sits on the rear side of the bike and requires you to buy a 2-1 exhaust. This of course seriously bumps up your costs but does give you the capacity.
We're currently on a RTW on XT's (had to sell the 990ADV) and had looked at tanks but they're all incredibly expensive. We're getting by just fine carrying plastic jerry cans. I've got 2 5-litre cans sitting side by side on my rear seat. Perfect and when they're not needed (95% of the time) they're so light that they don't make a difference. And, of course the cost £5 for 2!!
Not the answer you were looking for I know (sorry about that) but hope it helps....
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