This article is from the Ducatis Motorcycles FAQ, by Duke Robillard firstname.lastname@example.org with numerous contributions by others.
Three good sources are Gio.Ca.Moto in Ft. Lauderdale, Florida
(954-524-5272, www.giocamoto.com, email email@example.com), Fast By
Ferracci, near Philadelphia, Pennsylvania (215-657-1276, www.ferracci.com),
and PI Motorsports (formerly Pro Italia) in Southern California, (3518
North Verdugo Road, Glendale CA 91208, 818.249.5707,
www.pimotorsports.com). All of them have on-line catalogs, and you can get
hardcopy, too, if you call.