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I'm a little confused.
If the holes are in perfect shape, why not just use the same holes to mount up your bindings?
If the holes are stripped and will no longer hold a screw properly, you a few options:
1) Remount the bindings. You can mount them where ever you like despite the fact it is a symmetrical ski. However, the ski's flex pattern and shape is designed to work BEST at center mount. Keep that in mind.
2) Purchase a new set of bindings with different mounting heel pattern that what you can still mount center because you'de have to re-drill the holes for the new heel pattern.
3) And honestly the best choice in this situation and what I would personally do is this: http://www.newschoolers.com/ns/forums/readthread/thread_id/564982/
I have a pair of Invaders too. Hopefully this won't happen to me.