One of the all time wonder lusts of my motorcycle years is the 1989 to 1992 Ducati Paso 906. However my passions were tempered by the early models problems with carburettors.  The following is from Wikipedia.  "In 1989 the Paso 906 was introduced to replace the 750 (the 750 Paso was the first of this body style brought into the USA), with a six-speed gearbox, a 904cc engine which provided 88hp and a 220km/h top speed. the bike still had the same automotive carburettor and unreliable electrical system, but its greatest development was the incorporation of liquid cooling. 1,802 Paso 906's were built between 1988 and 1989.
After further development, the final version of the design came in 1990 with the 907IE(Iniezione Elettronica): now without the name "Paso".  the engine remained liquid-cooled and the carburetor was replaced by the most modern Weber-Marelli IAW 043 system that integrated ignition and electronic fuel injection, which transformed the ride ability of the bike.  Power increased to 90HP and top speed to 230km/h. The wheels were changed to 17 inches, giving the bike more stability.
Despite these advances sales of this model remained sluggish, and when production ceased in 1992 only 2303 907IE's had been built".

Trying to find a 907IE may be a difficult search, however the numbers of bikes coming into the US is about double the number of 1983 Yamaha XJ900 Seca's.  Ebay, Craigslist, or perhaps even at Retro Motorcycle Blog, may be your best source.  I am suprised at the number of requests we get from active readers of our blog, and Facebook, for parts.  Let's build the Retro community together.  JF