Hi,
you may visit this page via Google Chrome and get it translated:
http://www.z750twin.de/twin_modelle.htm
Additional disc, caliper and splitter are needed.
Depending on your bikes setup, stuff of the KZ650 (four) models may match.
A B3 is from 1978, a B4 is from 1979.
There was no B-model but only the G-model built in 1980 !
Cheers, Michael
