Replying to Schizo/ k2 Extreme question

aight im pretty good with bindings and shit but i got these extremes with schizos on them for free and im having trouble trying to get them centred so i have a few questions about the whole system

are the holes pre drilled on the extremes? and am i able to mount another binding on the ski if they are?

if they are pre drilled is it even possible to adjust the binding to center?



if you guys have any info on these i would apperciate it, i looked around but cant find anything useful