Polaris Window Balance Spring

A quick learner from Marysville, OH says:
Would like confirmation of the balance spring needed based on the photos. I did not remove the existing hardware because I will need to notch the track to remove, which I will do after receiving the new part.
Current spring width is 3/4" and weight of sash is 16.0lb. Based on the part description, pivot shoe type and weight of sash, I believe that I need part S170-408 .
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Emily from SWISCO responded:

Hi there!

The Series 170 is designed to work with the 15-192 which is very different from your original pivot shoe so this isn't what you'd want. Yours was actually recently discontinued but you can use the 15-177 to replace it. This uses the 1/2" wide Series 152 coil springs so I recommend double checking the width of your old coil band. You may want to remove it from the window in order to get an accurate measurement. 

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