If the product is faulty and you can send in the broken ones, Im fairly sure KEE will replace them. Try emailing tech@paintballsolutions.com they will be able to help you out.
If you just lost them, like we all do, then give Gunsmoke a call.
Nah I broke em, if you look in the picture the left one has a crack down and it is bent quite far back. It isn't a busted mask, it still works and I've read up that people use them without the clips however if I want to resell it'd be handy if everything was there.