Metal bifold doors missing hardware pieces

A handy person from New Palestine, IN says:
Metal bifold door from 1979 era mobile home. Need to identify which parts I need. Have top and bottom tracks, but missing reciever pieces at top and bottom. Can take more pics if needed.
Thumbnail of the uploaded file named Closer pins
Thumbnail of the uploaded file named Pin cap
Thumbnail of the uploaded file named Closet track
Thumbnail of the uploaded file named Track profile
Thumbnail of the uploaded file named Broken pin
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Paul from SWISCO responded:

Hello,

It looks like you may have a National bi-fold door. If so, take a look and compare the parts related on this page to yours. Just let us know if you have any other questions and thanks for posting.

A handy person from New Palestine, IN says:
That's perfect thank you. Looks like I need a bottom pivot a top pivot and two "followers" not sure which of the 21-042 and the 21-072 is pivot and which is the follower. Thanks, Dave
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Paul from SWISCO responded:

If you're referring to the part with the meal pin cap, that would be the 21-041. The 21-072 uses a nylon cap like your second pin. 

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