window channel balance

A quick learner from GILBERT AZ says:
Hello...I am Looking to replace (2) two window channel balance slides on a window that is failing. Based on your website here, I see that we can narrow our search by the 1/2" width measurement, 35" length. But there are several choices to make & pick from. I do not want to order the incorrect Part Number. Can you assist? Thank you!
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Casey from SWISCO responded:

Hello,

Take a look at our S350-35 channel balance and compare the specification on our product page to your balance. You'll also need to locate the stamp on your metal channel to choose the corresponding strength option. Thanks for posting!

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