Help identify needed part

A home owner from Sykesville MD says:
Hello
I have old non-tilt windows which are having a hard time staying up. I believe the issues is with the balancer. Can you help identify the needed part so I can replace them?

Thanks you
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Casey from SWISCO responded:

Hello,

It looks like our 15-104 friction shoe will make a good replacement for yours. Take a look at the dimensions on our product page and let us know if you need anything else. Thank you!

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