Channel replacement help

A quick learner says:
I need to replace two window channels I've attached pics. It measures 35 inches metal to metal. Please tell me which Swisco partn number I should order. Thank you.
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Casey from SWISCO responded:

Hello,

Take a look at our S395-35 channel balance. The stamp on your old balance is outdated, so you'll need to weigh your window sash and follow the chart under the product description to choose the correct strength option. Thank you!

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