http://www.superiorseals.com/. We had to have an order of more than five dollars so we ordered a few of each in different materials.Yesterday we finally got a few O rings in the mail for the cream separator. We tried looking in Minot for someone that had the right size but each place we looked at said to try a different store and we didn't find any the right size. Dad found one online at:
This morning I tried fitting them where they would go on the cream separator and one of the sizes fits perfectly. We had gotten two of that type so now we have a spare. If you have a old DeLaval cream separator that needs a new seal for the cone shaped spinner, get this one: Buna-N 427 Size O-ring, product no: ob-70-427 from that website. It may not be a food-grade rubber material, but we will use it until we find a better one.