Track used for cap 21-103

A quick learner from Winter Haven Fl says:
I need 1/2 inch deep track used with National bi-fold door. The bi-fold door pin cap appears to be identical to 21-103. Do you have 48" track that works with this cap?
A quick learner from Winter Haven Fl says:
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User submitted photos of bi-fold door hardware.
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Paul from SWISCO responded:
I'm afraid the National tracks are no longer available. However, I found a track that may act as a substitute. See our 21-453, which is 1/2" high and will work with your guide pin (I believe you have our 21-072). It will not work with your bottom threaded pivot pin, so I recommend swapping that out for our 21-003.
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