Shower plastic track guide

A home owner from Lawrenceville, GA says:
Hello, I have an older shower that one of the plastic door track guides has designated. Any suggestions on how to find replacement parts? Any and all suggestions would be appreciated!
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Tom from SWISCO responded:

This guide looks similar to our 10-139. I cannot guarantee that this will work on your shower door but I think it's at least worth considering.

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10-139 Shower Door Bottom Guide Instructions
10-139 Shower Door Bottom Guide Instructions
GUIDE
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