Need replacement "O' rings for unidentified side joints

Need replacement "O' rings for unidentified side joints

Dear Colleagues,

I have a trans tibial Veteran with side joints and thigh lacer. He has
developed some play in the joints and I wanted to replace the O rings.
There are no ball bearings in this joint. Its just metal to metal with O
rings between surfaces.

I haven't been able to find this particular joint in the catalogs I have
looked in. Does anybody know who makes this particular joint?

Thank you,
Mark Benveniste CP
VA Med Ctr
Houston,TX