Gahh I'm looking for this too for my 2010 696. Seems they are discontinued and the only ones popping up here and there are in Europe and costing $$$. So I'm thinking of buying the stock seat and cutting out some foam so I'm going to post about that if anyone has experience with doing that etc.
Set up a Search on eBay and it will notify you. They are scarce, but not impossible to find, especially if you have the part number. As far as doing it yourself, I cut the foam down with a electric carving knife ( saw it on tv) , it worked well. Then I wrapped the old seat cover around to take up the slack and attached it and cut off the excess. It wasn’t a Ducati and the cover was secured differently. I also had an aftermarket Ducati seat recovered by a guy with a booth at a swap meet. He did a nice job, but I had asked him to lower the seat and he raised it instead. It’s comfortable , but not what I asked for. The low seats pop up on the Ducati forums from time to time, too. Have you checked upholstery shops near you ? Some have experience with motorcycle seats.