For the unused holes, I'm thinking just use some RTV to seal them. Other ideas? I'll have to trim down some volcanoes from the PO first.
For the others I found holes were wider apart at 32mm or 40mm, roughly. Any idea what bindings use that? Then there are "triangle" hole patterns to figure out too.
9. K2 Instinx w/ tip holes, telemark (tricky one!)
11. Fisher S200 LX Air Channel, PowerLite Sceneo 165, R17, 110-70-98, A 315
12. K2 Work Stinx w/ tip holes
full size image of the below
Based on some quick tests to confirm eyeball, I think they're M5 with 0.8 pitch. I've pulled a Targa screw to match the head and length and a random screw that matches the size+thread to screw in enough (it might be an 10-32 that I'm using, which will be close enough to match at store with metric).
EDIT: They are M5 x 16mm, 0.8 ; do NOT use 10-32.
See https://telemarktalk.com/viewtopic.php?f=1&t=5604&p=57074#p57019