I searched for days but got no clear answer to whether or not they were compatible. I emailed Z1 and even they recommended Cometic over OEM. Then again those are the same folks I ordered a used 5 speed trans for a 92TT from and received a 96 na trans complete with a NA speed sensor for my TT rear end... but that’s neither here nor there
I still feel that thickness should be considered especially with interference engines.