Are you sure they don't use a keeper like this? We've switched almost all of our buckets over to these Esco shanks. I think I have one 18" and a 30" bucket that we havn't switched so far. We dig a lot of rock with the backhoes, and I got tired of replacing broken shanks for the 23 series teeth. I don't know if they changed the material the 23 shanks are made of, or what. But it seems that they wear down a lot faster than they used to, and break right thru the pin hole. It's been a little over 2 years since we switched to the Esco's, havn't broke a shank yet, and the teeth still fit tight on the shanks. I've noticed the Esco teeth wear a lot longer also. We but the Esco stuff from our Komatsu dealer. I think the last time I bought teeth, they were about $17 a piece. Little bit higher than the 23 series teeth from Case, but when you figure they last about twice as long, not a bad deal. I don't remember what the keeper pins cost, havn't had any of them were out yet.