AFAIK, hinge and latch positions are all the same.
The late model IE tank with the largest cavity on the bottom, as was fitted to '01 -'05 Desmoquattros (S4 and S4R) would be your best bet.
Pretty sure there were some of the 2-valve Monsters that used that tank as well.
This thread will help:
http://ducatimonsterforum.org/index.php?topic=541.0