Winchester model 67

A friend bought two model 67 Winchester rifles via a third party from an estate sale and discovered that both are missing the extractor/sear. Both rifles are in excellent shape and show little wear. Both have some nice after-market aperture sights. Anyhow I looked on Numrich and a couple of others and those parts are scarce. I wonder if anyone here knows a source, and I also wonder if this particular rifle had an issue with the sear. It seems that most other parts for that model are available. One more thing; Can you tell me if there is a difference between the extractor/sear for the model that shoots shorts, longs, and long rifle, and the one that only shoots long rifle? It appears there is a distinction made for two models in the Numrich catalog.