Hi,
It seems that monster silencers will also work for a carb'ed bike according to this thread:
http://www.ducatisportingclub.com/xm....php?tid=21086 They do seem to go for quite a bit - as I've been wanting some low level (prefer Road legal but not essential) can for my 93 900ss.
Here are some others on Ebay:
http://cgi.ebay.co.uk/Triumph-Dayton...QQcmdZViewItem http://cgi.ebay.co.uk/ws/eBayISAPI.d...MEWA%3AIT&rd=1 900 monster parts for sale - your need seems greater than mine - go for it:
http://cgi.ebay.co.uk/Ducati-monster...c mdZViewItem OUCH - New from SParesshack - but still cheap I guess:
http://cgi.ebay.co.uk/DUCATI-MONSTER...cmd ZViewItem YES !!!
These look more like it for you:
http://cgi.ebay.co.uk/DUCATI-900SS-S...QQcmdZViewItem Just around the corner from me



Good luck