Thanks for the help. I found a set of 4 at Ducati of Seattle and they're en route. Very helpful folks. I'll certainly use them again.
Norm--You need to brush up on some basic Ducati nomenclature and techie stuff. Valve stem seals are the little rubber boots (two green and two black) that slip over the valve stem of each valve and serve to keep oil from blowing by the valve guides, into the combustion chamber and out the exhaust. Split or damaged valve guide seals result in excessive oil consumption.