I had made a custom adapter out of aluminum, it is more involved in having it manufactured then Woza01 however I wanted something different. Any one interested they can download drawings from my site http://my240z.info/upgrade\ebrake
Very good design however I went with aluminum at different cost to have it made and used the Wilwood mounting plate for the MC4 caliper to which the float pins are mounted through.
I cant seem to add a picture so here is my link to the picture
http://www.my240z.info/upgrade/ebrake/2016-08-25_bracket-mc4_01.jpg
Write up on the upgrade is on my page http://www.my240z.info/upgrade/ebrake