I got a Best rubber seal part number 4519S from Northwestern Auto Supply up in Michigan. He says its going out today. He only had the one in stock. My machine shop is sending me two Fel-Pro Rubber ones that will be here tomorrow. Then earlier today, I ordered a Best Rope seal. I have seven engines to eventually get to, so I will keep the extras in an environmentally controlled area until I need them.
Thanks everyone for taking the time to help! And yes, Tim, I paid $45 for the 4519S. They are very proud of them.