Searching eBay with the addition of -fits in the search box will weed out the universal fit parts.
Having said that, the new fuel tanks that you will find might fit your bike. Lots of those items have good measured photos. But most likely they won't fit like a stock tank, seat to tank gap may be larger and you may have to fabricate mounts. Also I wanted to mention some of those 9 liter tanks were going cheap, I haven't looked in over 6 months though so maybe not any more. Inexpensive repop tanks may also have leaks and surface rust, they probably need to be lined anyway, just like the tank you already have...
