If it was me I would get the spare parts catalogue from the Ducati website here:
http://www.ducati.com/bikes/catalogs.jhtml Check the part number for either the span adjuster or the full lever (which I think includes the span adjuster).
Then download the same spare parts catalogues for the Monster / Superbike / whatever as necessary, and check the part numbers for those as well - you may find that they match.
If they do match, you'll know that a part from M&P / Pro-Bolt or whoever that will fit the other model will also fit yours.
I've done this loads of times when hunting for parts for my 600 which look the same as later stuff, but you just need to check.
Hope this helps!