Replacement pieces for a cheap Chinese Respirator

I had been using a bandanna for protection from breathing in sawdust in the woodshop. Then I picked up a CHEAP Chinese respirator on SneezeBay. Being too cheap to buy a decent one at the local hardware stores. It works fairly well for the most part. But I did have two of the tiny little plastic pieces break on me. So at first I was going to use the broken pieces, glue them back together then make an RTV mold from them, then re-fabricate them out of epoxy putty. But then I had a procrastina