Channel track bottom guides

A home owner from Vegas says:
I'm looking for the bottom track guide that slips into the door channel frame. Inside channel frame is approx 9/16". The photo of the top roller might be of use to see how the bottom guides slot into the door frame. Any help would be appreciated.
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Tom from SWISCO responded:

I'm afraid that I don't know what bottom guide you need. There's a good chance that your hardware isn't made anymore. You could have something like the 23-235 , but that's just an educated guess. Without seeing the original there's just no way for me to know for sure.

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