sliding window roller assembly

A handy person from Seattle, WA says:
Roller assembly is from a 1970s-80s sliding window.
There are no manufacturer's marks on either the roller assembly or the window unit.
Concave wheel runs on metal track screwed to the bottom of the window frame.
Thumbnail of the uploaded file named rollerassembly_sm.jpg
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Tom from SWISCO responded:

Thank you for contacting us. Unfortunately, we have not been able to find a sliding window roller that matches your specifications. The closest part we have in our inventory is our 81-246, but this is made for sliding glass doors. It also seems a lot bigger compared to your dimensions, as well. I'm sorry that we cannot offer a better match.

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