Window sash channel balance

A quick learner from delaware says:
25" length, channel is 1/2" stamped with 2410. Top plastic part broke has 6603 stamped on it (I had another one break). Windows were installed in 1980.
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Paul from SWISCO responded:

Hello,

It looks like the balance you need is our S370-25 with a spring weight of 2410. Let us know if you have any other questions. Thank you!

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