Hmmm....Don't know about the black ones. Is it gloss black or that metallic charcoal?
Probably the best way would be to look up the colour name and paint code in your handbook (or on the online handbooks on ducati.com if you don't have a handbook) then go down to a paint factor who can make some up for you. If you go to a PPG paint stockist they should know since PPG are the paint suppliers to Ducati and they should have all the colour swatches