Pegs and seat would be cheap - most people go the other way from double to single. Certainly less than 200 quid for mint items.

Have a look on ebay as theres usually a few on there.

I might have a bip seat unit for sale - no pegs or pads though, just the plastic. It's off a 996 but they're pretty much the same animal.

I won't know until after this week but let me know if you're interested.

Two seat units on Ebays at the mo !!!!!

This link is usefull
http://www.gastric.com/toys/ducati.htm

Oh about £140 if its got the odd mark on it.