This one would do the job, might be the one spence was thinking of
£150 so not a bad price but needs collecting from up North
http://www.ebay.co.uk/itm/DUCATI-MON...em2c673 fba04 Older 600 frame here but up until 2002 the frames are mainly the same
http://www.ebay.co.uk/itm/DUCATI-MON...em27c30 31f75 and another here
http://www.ebay.co.uk/itm/GENUINE-DU...em1e6b5 be4c7