Hi
I noticed you have detected the soure in Germany which is
www.z1300.de
Tehre is another guys who has tons of spare-parts (and bikes as well), his page is:
www.kawasakiz1300-der6zylinder.de/
or mail: der6Zylinder@web.de.
He is the guy who rebuilt mine and is specialized in the KZ1300 (sidecars as well). He usually works against payment in advance, but I never got any bad parts from him.
best regards,
Holger