Better built window

A quick learner from USA says:
I need these rollers that gin on the bottom of sliding windows about 20 years old
Thumbnail of the uploaded file named Window Roller 2.PNG
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Casey from SWISCO responded:

Hello, thank you for writing in. We don't have an exact replacement for your roller, but take a look at our 87-200 and see if you could adopt it to your window. 

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