Tom from SWISCO responded:
March 3, 2020
Thanks for reaching out to us. Your bottom track resembles our 21-450 and 21-452 (as well as other sizes under different product codes). What's peculiar is that these are made for bifold doors, not sliding doors like yours. Either way, look them over and let me know if they match. Make sure to check the size of the profile and length. Like I mentioned, we have other sizes if needed. Dimensions of the bifold track.
Dimensions of the low profile track assembly.
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