Got a whole brochure on Paioli suspension somewhere, they do some decent stuff. There was a bloke (John I think, based around the Brackley area)) that quite often shared a stand at race shows with Derek Chittenden of Hejiera (something like that) Racing that sold the stuff If you have the model of shock I may be able to find out more about it.
Just seen it on ebay, looks just like the shocks they fitted to the Laverdas except it has a piggy back reservoir where as the Laverdas were attached by braided hose. Its even got its own rideheight adjuster, not exactly necessary on a 916 but then again the Penske on my 916 has one
Certainly has enough travel on the damper rod, unlike some aftermarket shocks I have seen as this often indicates they have been modified from other bikes rather than designed for the job in hand which in this case would be suspending the rear of a Ducati