The wheels for windows to help sllide

A quick learner from Newbury Park CA says:
A lot of my windows are missing these wheels. It seems like they pop off and can be replaced to the other piece still attached. And some windows seem to be upside down and wheels on top. But need them on bottom so they can slide easier.
User submitted photos of a window roller.
Profile picture of Tom
Tom from SWISCO responded:
Thank you for posting. This looks a bit like our 87-185 and 87-155. Do you think you could use either of these as a replacement? The wheels seem to match, which is what caught my eye. At the very least, you can pop the wheels off our roller and put it on your own hardware.
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