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Tom from SWISCO responded:
January 15, 2020
Hello! We do happen to have this part, yes. Or, more accurately, we have these parts. You see, what you have here is a coil balance system. The individual components of this kind of balance are all sold separately, allowing you to only replace what's broken. You can reuse the rest. In your case, I recommend our 15-087 pivot shoe/housing, 15-086 secondary housing, Series 180 coil spring, 16-024 mounting bracket, and 33-072 screw (for the bracket). The diagram below may also help you understand how these all work together. Since your window won't stay up, the Series 180 coil spring is definitely one of the parts you need to replace. This is what does all the lifting and holding. The rest of the parts really only exist to keep these springs in place. Understanding that, you should keep in mind that you'll need the stamp printed on the original in order to choose the best option. These stamps indicate the calibration of the spring. 
Detail of 15-086
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