Needs balancers for windows

A landlord from Culpeper,VA says:
Looking for parts for these windows. Sma property in culpeper, VA. Another of windows are stuck closed or not staying up when lifted up.
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Casey from SWISCO responded:

Hello,

We'd be happy to look into this for you but we'll need a bit more information to get started. It also looks like your photos may be showing the 15-170 clip shown below. To confirm, we would like to see the pivot shoe that you your balance anchors to. Lastly, we'll also need to know the numbers stamped on the metal balance channel to determine the spring strength needed for your replacements. Thank you! 

Dimensions for 15-170
Dimensions for 15-170

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