I've never seen anyone who offers custom scales for the M16 line. I could be wrong though. The time, effort and money involved would most likely be more than the value of the knife (no problem with the knife). Here is the link to crkt parts. Would suggest you call them and ask if they can sell you replacements.
I suppose you may bump into someone who has one with a damaged blade and would part it out...
They are good on the phone and will ship the parts they list on the parts page but I do suggest calling them to verify as scales don't appear on their warranty parts list.