Replacement Parts for Metal Bifold Doors

A landlord from Chicago says:
I need to replace the item in the attached photos. Can you identify the part from the photo.

I am having problems with the other hardware on the door;the pivot. From this photo is it possible to say the manufacturer of the other hardware?

User submitted photos of bi-fold door hardware.
Profile picture of Paul
Paul from SWISCO responded:
Based on these photos, I can make out a guide pin like our 21-078. If you need other parts replaced, however, I will need to see pictures of each one.
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