The new springs arrived last week and I had them installed by a local Ducati specialist. I went for the 1 kg/mm rating springs, part No. FRSP S3732 100, they came with an 18" length of aluminium tubing, 6 washers and some instructions.
You cut the tubing to length to suit your setup. The washers are used both ends of the tubing to give the springs a flat surface to sit on.
It definetly feels a little bit stiffer than before but still gives a decent ride.
It is noticably harder to compress the forks by pushing down on the bars with the front brake on, where I could almost bottom them out before I now have a good inch plus.
The true test will be when I hit that next big bump or pothole, so don't know yet if it will still bottom out or not, I hope not.