[DesmoDog]

Have you tried;

Syd's Cycles (Florida, no web site. Try Google)
http://www.roadandrace.com.au/
http://www.bevelheaven.com/
http://www.desmo-ducati.de/index.htm
http://www.ducati-gowanloch.com/
http://www.oldracingspareparts.com/
http://www.angelfire.com/biz/laverda.../mainframe.htm

Or maybe even
http://www.mgcycle.com/

???