Thanks Jon. So you're saying whatever line I chose to mount on, mount the toe of the PLUM 5mm back from that line (I assume this puts the 4 holes for the PLUM toe equidistant from the 2 back holes on...

Anybody have luck fitting inserts for the PLUM guide/dynafit/onyx and 916S on the same ski? Printed out the templates and I can't see how I could do it without going like 4cm forward/back.