Shock absorber parts

[Don S]

I have 4 shocks just like this that have been on my car for a very long time. I bought them in the mid 80's ,but now one is leaking. I took the right rear one off to check ,removed the reservoir plug, and the adjustment needle . I then drained all the fluid out, lots of little bits of what appears to be rubber was in the fluid. A magnet did not find any metal in the fluid. I am wondering first about the cover,Ford logo cover etc., and the needle in the picture. What I have seen in catalogues look like one piece, but mine is definitely two pieces , not broken in half. So the issue is , are these 36 year old shocks worth rebuilding ?