Lower sash balance

A handy person from Roselle, IL says:

Hello,

This is an American Craftsman brand double hung window. The sash balance for the lower sash on the right side (viewed from indoors) has broken. Can you identify the correct replacement for me? Is it advisable to change them in pairs?

Thanks,

Bob 

Thumbnail of the uploaded file named IMG_7596.jpg
Thumbnail of the uploaded file named IMG_7597.jpg
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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. If everything matches up, we do recommend replacing the balances on both sides of the window at the same time. Thanks for posting! 

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