I sorted the problem.
My Japanese imported XR250 tank mountings are different to the mountings on standard "rest of world" XR's. My bike frame had pegs with rubber grommets protruding from the bike frame. On the inside of the tank were two U sharped protrusions to slip over the frame pegs. (hope that makes sense)
The acerbis tank has pegs fitted to the tank which bolt onto the frame as you have described.
I have welded two large diamater protrusions, with 8mm threads in the middle, onto the side of the frame to line up with the Acerbis pegs and the 22lt tank now fits perfectly.
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