Peter - I don't have any Cinelli Unicanitor (note spelling) saddles currently but have sold some on ebay in the past. They are out there if you look. To make life easy on yourself with the two bolt seatpost, get a ratcheting 10mm wrench from Park or Sears. The Sears one is offset so is even easier to use. Makes a 1 minute job out of it.
Bob Freeman