1970's era bifold hardware

A quick learner from USA says:
Need help with these replacement parts for 1970s metal closet bifold doors. I am attaching some pictures.

I have pins, but need caps, springs, and whatever holds the pin in place.

Can you help me?
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Paul from SWISCO responded:


We'd be happy to help, but we'll need a little more information to get started. Is there a name of the manufacturer on the inside of the door? Also, what is the diameter of the metal pin and nylon cap? May we see the track, the pivot block and the bottom threaded pivot pin? With that information, we should be able to narrow down your options. Thank you!

A home owner from Montgomery, Al says:
I believe the pin is 5/16 diameter and 4" or so in length.
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Tom from SWISCO responded:

Thank you for replying back with more information. The one pin you are showing us is our 21-041. The pin with the nylon cap is the 21-005 or it could be the 21-065 with the spring. Take a look at all parts mentioned and see what you think.

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