Paul from SWISCO responded:
August 21, 2017
I'm afraid your track has been discontinued, and the manufacturer never made a replacement. If you want to try a new style track, you will also need to replace the door pins. As an example, you can consider two 21-404 (4') tracks for the top and bottom. You will then need two 21-001 bottom pivot pins and six 21-007 guide pins. Again, this is just an example, but it's one that I think can work. The other choice would be to buy new bi-fold doors entirely.
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