Sorry, but that doesn't sound right. Ducati may not sell them, but Brembo do.
Unless of course its because spares for your calipers are no longer available.
I brought a new set of pins and clips for my calipers some time back, as they were starting to notch where the pads sat.
I am not entirely sure where they came from (my local shop got them for me), but they were in a brembo plastic box. Last place they got my parts from was Snells in Alton, so might be worth a call.
These pins are meant to be a service replaceable item like the pads.
are these any good ? http://www.bevelheaven.com/stuff-for-sale-brembo.htm
or maybe this guy can help http://cgi.ebay.co.uk/MOTO-GUZZI-STA...1%7C240%3A1318