If no luck consider going to a rigging shop. They may have some thing readily available.
Of ask if they can make something using 316SS rod. A hole could be drilled for the ring and a flip lock flap on the other end which is a better anti loss preventer. Those wee balls often seize or don't hold all that well unless the hole is still a good fit.
That flap, can't think of the specific name, has to be held inline with the pin to pull the pin through for extraction.