Plastic channel guide for sliding mirror

A handy person from Rising Sun, Indiana says:
This came out of a medicine cabinet with 2 sliding glass doors made circa 1984. I believe it is for the bottom rail and there should be 2 per mirror. The unit has no manufacturing marks on it. The home was built in 1984.
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Emily from SWISCO responded:

Thanks for reaching out to us! We don't sell a replacement for this channel guide, unfortunately. I'm afraid we're not sure who may have it. I am very sorry that we won't be able to assist with this repair but please let us know if you have any other hardware questions.

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