Terry,
Have you looked at Rocket Seals in Denver, CO for O-Rings or seals?
They have supplied parts for the Space and Defense Industry since 1956.
THE LARGEST O-RING AND SEALING PRODUCT INVENTORY IN THE WORLD
Since 1956, Rocket Seals distributors have offered OEM and MROs the sealing product inventory and specialized expertise you can trust.
https://www.rocketseals.com/