Replacing coil balance

A quick learner says:
September 27, 2023
The window weighs 20.6 lbs. The coil balance is a half inch wide. We can't find any no on it. I will include a picture. I hope this is all the info you need to tell us which one to use.
Profile picture of Lauren
Lauren from SWISCO responded:
September 28, 2023

Hello, thank you for posting,

Your pivot shoe resembles the 15-111. Please review the dimensions to confirm a good fit! If the coil spring is a 1/2" thick, please review the Series 160 coil springs. For a 20.6 pound window, you can use (1) S160-10 coil on each side of the window. 

Alternate image for 15-111
Alternate image for 15-111

Please review and let me know if you have any additional questions. 
Pivot Shoe, 1/2" Thick
Pivot Shoe, 1/2" Thick
15-111
$2.44
10 lbs Series 160 Coil Balance
10 lbs Series 160 Coil Balance
S160-10
$6.34
1/2" Coil Single Support
1/2" Coil Single Support
15-150S
$1.10
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