Window counterbalance spring

A home owner from Lake Worth, FL says:
The metal track is 30" not including the plastic ends. We just purchased the house and believe these are original springs from 2000 when the home was originally built.
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Casey from SWISCO responded:

Hello,

Take a look and compare our S377-30 channel balance to yours. You'll also need to locate the stamp on your metal balance channel to choose the corresponding strength option. Thank you!

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