A handy person from Los Angeles says:
Need help finding a new roller for the Monarch Sliding Glass mirrored door. I have attached two photos, one of the track and one of the "wheel"
Thumbnail of the uploaded file named 1CE95A44-42F8-413B-B987-8D32A07173AA.jpeg
Thumbnail of the uploaded file named 6E9C1F09-27EC-4B75-8995-53E4B7042B85.jpeg
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Bob from SWISCO responded:

This looks like either a 23-042 or 23-074, depending on the shape of the extruded boss that connects to the mounting bracket. Compare both with your old roller to see if either matches. 

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