Caldwell window balance

A home owner from Long Beach says:
Hi, I need to replace this Caldwell Window balance in 2 windows. Can you recommend a replacement?
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Emily from SWISCO responded:

Hello there!

Thank you for reaching out to us. Either our S390-25 or S351-25 appears to be a match for what you have here. You'll have to measure as shown below to determine the proper Series. Based on the 24 2 stamp on the metal channel, you'll need the 2420 option.

Comparison of the S351 and S390 balance shoes.
Comparison of the S351 and S390 balance shoes.

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