I spent ages looking , and ypu have three choices ;-
1) Halfords do a self adjusting thing that looks like a spider ..... 2) The old stap thing , but you will get clearance problems 3) A screwdriver .......
Ducati employ apes on steriods to put on the filters ....
After trying various other methods 3) worked for me. I wish I hadn't wasted 4 hours before using the screwdriver ......
use 3/. its so bloody easy oilbin under filter screwdriver and mallet tap, tap oilcovered danny's but hey presto the bloody thing rotates off
however for those that want more finess Halfords now have a metalband type assy thats ultrathin so can go over body of filter but no. 3 is always cheaper, quicker, easier No doubt Nelly will call me a bodger, but it werks!!!!!!! rgds mort
I would caution you about the cup type. Usually the filters are on tight enough that those simply round off the edges on the filter. I have one, and it never worked. The strap type work well as already recommended. I've been down the screwdriver route as well and it once simply tore apart the casing. At that point you're down to the base and you need a tool to get the remainder off. I made a tool for that, as well.
Mood: Awaiting the arrival of the sun and the disappearance of the rain
Failing that.......do the oil & filter changes yourself B4 each service and then you can be sure that King Kong didn't put the filter on in the first place.
I use a Sykes Picavant tool. It's a spring steel strap that is tightened around the filter, then use the whole tool as the lever. The harder you push, the tighter it gets. It's universal, and hasn't failed to shift a filter in over 15 years!! They still make 'em to, I think.