Window channel replacement

A quick learner from Seminole, FL says:
Please help identify correct part number to order. Channels are stamped 36-9 and measure 37".
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Casey from SWISCO responded:

Hello,

Take a look at our S395-37 channel balance that has wings on the top attachment but not on the bottom. If it matches up to your balance, you'll also need to weigh your window sash since the stamp on your balance is outdated. See the chart under the product description to choose the correct strength option to support the weight of your sash. Thank you!

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