Hi, if your into new try the aussie site,
http://www.rvaqualine.com.au/page.php?sId=13
I have swapped xr 400 and xr650 tanks onto the ttr with out much hassel, although i have a little 17lt at home doing nothing,,, not big and not close :-)) good luck, ps, the xr is common here so loads of gear available.. if you need a hand getting gear let me know, cheers al