you cant get those.  i have that same issue, salomon does not sell them, and if you warrantee them, you will get sth16s back.  if you actually lost them, you can hack apart a 914 or 12 with a dremel and re-fabricate them to fit the 916, then glue them in (this is where it gets tricky).  ive used gorilla glue, epoxy, and urethane, and none of them held for more than a few days.  my 65 year old boss who knows more about bindings than i could ever hope too says these are important for a smooth release, but it doesnt show up on a VT calibrator.  i have a few friends who have let them fall out, and never did anything, and say it doesnt effect the release.  this year, im might try to use a base welder to re fabricate some, or stop trying to replace them.  i have 5 or 6 916s, and this is happening to three of them, so im getting sick of dealing with it.  let me know what you decide to do and if it works