1970's Metal Bi-Fold Door Replacement Track

A home owner from St. Louis, MO says:
Can you tell me which track I should try to replace on my 1970's Metal Bi-Fold Closet Doors? I can't tell from the pictures if I need 21-401 or 21-452. Attached in my pictures are the doors, the track and hardware off one side of the doors.
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Bob from SWISCO responded:

Your pins appear to be our 21-001 and 21-007. If so, then the 21-401 Track would be the right match.

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