Yes you can get the 750 and 900 systems to fit the 600SS, NOT the ones from the Injection models as the silencer mounts exit at a different angle making the silencers sit in a different place.
Along with the left hand silencer you also need the header flanges and collets to fits it to the heads.
On my Desmo Due race bike I have a 900SS Exhaust modified with a new 2 into 1 collector that I had made
There is this standard system on Ebay at the moment
http://www.ebay.co.uk/itm/Ducati-600...em4168c 70f61