Constant force spring balance

A quick learner from Gaithersburg, md says:
Need constant force spring balance for 40"wx26"h
Window sash
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Casey from SWISCO responded:

Hello,

You'll need to removed your original coil balance hardware and see how it compares to our 15-087 housing and  Series 180 coil springs. Thanks for posting! 

A quick learner from Gaithersburg, md says:
Thanks for reply and identifying parts
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