Searching for Windsor double hung replacement parts

A quick learner says:
This is at the end of the spring assisting the raising and lowering of Windsor double hung
Window. This is the upper window but the lower window which does not work is the same
Configuration. Need a new plastic piece that has broken
Thumbnail of the uploaded file named image.jpg
Thumbnail of the uploaded file named image.jpg
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Casey from SWISCO responded:

Hello,

Take a look at our 15-104 friction shoe. This should work for you, but make sure to confirm that they dimensions on our product page match your current part. 

Let us know if you have any more questions or concerns. Thank you!

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