This is a 26mm pantah clutch piston kit that might fit your clutch cover (there are a few different piston diameters for Ducati)....
We have verified fitment in a 750 Paso, and 659 Elefant & 650 Indiana. Other bikes? Please let us know.....
The actual OD of this piston using our highly accurate Mitutoyo vernier calipers is 25.91mm and the height is 18.54mm. There are 2 rubber oring seals on the piston as you see. These are sold EA - 2 are shown just so you can get various views of this clutch piston.
If you need the bearing that sits in the piston Ducati #75174.0827 click HERE to order it or choose from the drop down menu to get the piston only or piston + bearing.