coil spring for vinyl double hung window

A home owner from New Jersey, USA says:
June 2, 2022
I just need the spring. I can take it off of the spool on the other end, so I don't need anything else. If you look closely the coil is stamped with 5K. Not sure what that means. I doubt it stands for kilograms because I am american. There's one coil on either side of the window pane & only one has broken The coil spring is 1/2 inch wide.
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Emily from SWISCO responded:
June 6, 2022

Hello!

Your pivot shoe is a match for our 15-177 which uses the Series 152 coil springs. If your spring has the number "5" on it, you may need the S152-5 5 pound spring but you can always weigh your sash on a scale and divide the weight by the number of coils on both sides of the window to confirm. 
Coil Balance Shoe, Slate Blue
Coil Balance Shoe, Slate Blue
15-177
$3.47
5 lb Series 152 Coil Balance
5 lb Series 152 Coil Balance
S152-5
$4.80
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