aluminium window part balance stop(?)

A contractor from Boulder. CO says:

Hello,

I am trying to locate this part or at least identify it. I am replacing a balance. On one side the balance cannot be retained by the window guide because this piece has snapped off at the top allowing the balance to pass through. Any help would be appreciated.

Thank you in advance,

Norm

Thumbnail of the uploaded file named aluminium widow part top view.jpg
Thumbnail of the uploaded file named aluminium window part side view.jpg
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Emily from SWISCO responded:

Hi, Norm.

It looks like you need a new top sash guide. Start by having a look at our 18-010 and 18-065. Look over the dimensions and compare them with yours to see if one matches up. If you notice any discrepancies, let us know and we can work from there. 

How to Replace a Top Sash Guide [1080p]
How to Replace a Top Sash Guide [1080p]
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