At Darr Group, we work quite closely with the US Government. Currently, I have a requirement for production of parts that are elastomer material. Unfortunately, we do not currently have elastomer capabilities, so I am looking to subcontract this request. This will not be a large job (Target Price is around $1900 - $2000) and I would prefer to utilize a company that has capabilities for extensive break, bend, endurance, and overpressure testing capabilities. If you are interested, please send me a private message and I will speak further with you as far as what steps we need to take to send the drawing to you.
Try TRP. I came into contact with them whilst on work experience in the chemical processing industry. They manufacture high quality O-rings from Perfluoroelastomer (FFKM) and Fluoroelastomer (FKM), both durable elastomer types so they should be able to assist you: https://trp.co.uk/