I think I saw the ad on E-bay - could hardly believe someone would sell such a stunning machine......
I've been looking at some for a while now, Helibars made in the USA are available here at:
http://www.custom-cruisers.co.uk/heli_bars/ducati.htm they aint cheap however but......
Harris do a set of riser cip-on's that at least for an old 900ss I'm convinced will fit to the fork legs above the top yoke rather than below. Only for the brave though.
Good luck.