ACME Bottom rail hardware, US PAT 3058173 3261129 with 4023, also stamped4043-1

A quick learner from San Antonio, TX says:
Is this part still available. My bipass doors don't stay on the track because the plastic piece 4023? doesn't stay in the track because the mail part of the piece breaks.
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Tom from SWISCO responded:

This guide reminds me of our 23-220 . Yours seems to lack the same hook, but I'm not sure if it's because yours broke off or not.

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