Hi
Just found your site doing a search for P32B info...
Apologies if this is old info for you:
I was after a set of new pistons and seals, the old pistons were blistered through misuse, however I couldn't buy any, so I made my own kit, and here's how to do it...
1 x Ducati part 800029627 for the inner seals (about £20) - strangely you can't get this through a dealer - it is known as the P5 seal kit - google is your friend 2 x KTM part 50313081000 for the outer seals (about £5)
These fit the P32F too...
Pistons are unobtanium, the best solution I have found is to buy:
1 x KTM part 69013083000
...then put them in the lathe and take 1.7mm off the pad facing surface
Again, these fit the P32F too...
If you have a P32G, you need:
1x KTM 69013081000 (seals)
1 x KTM part 69013083000 (pistons)
But if you want a new caliper... Apparantly, Brembo sold the rights to Grimeca, and you can get awesome deals on these new...