Milgard: roller assembly

A home owner from Phoenix, Az says:

Need replacement roller assembly for Milgard horizontal sliding window

User submitted image of a sliding window roller.
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Tom from SWISCO responded:

Thank you for contacting us. It's very difficult to identify what you have while it's still installed. Our 87-201 is made by Milgard. Could this be what you need? Look it over and let me know what you think.

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