Need new window balances

A home owner from Amesbury, MA says:
October 4, 2022
All 4 of the window balances snapped (2 on upper, 2 on lower). Attached are the part photos and the window warranty label.
The coil is stamped "71J"
Thumbnail of the uploaded file named PXL_20221004_125433943.jpg
Thumbnail of the uploaded file named PXL_20220616_153236927.jpg
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Casey from SWISCO responded:
October 7, 2022

Hello,

Take a look and compare the 16-031 mounting bracket and 15/32" wide S180 coil springs to yours. Your coil stamp indicates that you most likely need the S180-7. To confirm, you can weigh your window sash and divide the weight by the number of coils used to support it on both sides of the window. Thanks for posting! 
7 lbs Series 180 Coil Balance
7 lbs Series 180 Coil Balance
S180-07
$4.97
Mounting Bracket
Mounting Bracket
16-031
$0.90
How to replace a window coil balance
How to replace a window coil balance
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