I believe that the Z3 has 'bubble flare' NOT 'double flare' on the pipe ends.
I base this statement on the adaptor on the end of the brake flexi shown below and picture 5 on this page :
http://www.fedhillusa.com/?page=flare
20180527_111700 by
WCA!, on Flickr
Please confirm that this is right or correct me if I am wrong.