Take a look at Air Tech. They have a whole range of stuff for Ducatis.
In the next few weeks I will be ordering a fairing from them to go on a project bike based on a '92 SS. The fairing is the same as on Hailwood's '79 IOM TT bike. I'm not doing the whole replica kit, just the fairing for that bike to get a retro look.
They also have late model stuff too. Prices seem decent on most of the stuff.
www.airtech-streamlining.com