Springs for 2 windows

A handy person from Houston, Texas says:
Hello,
Here are 2 pair of springs I removed from 2 windows. They're 1/2 inch wide by 28 inches long (not including nylon end pieces).
What part numbers do I need to replace them?
Thanks,
Justin
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Lauren from SWISCO responded:

Hello, thank you for posting,

Your balances resemble the S395-28 channel balances with a 2730 stamp option. This stamp option can support a 13 to 19 lb window sash. Please review and let us know if you have any additional questions! 

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