Replacement balance cylinders for 2021 sierra pacific double hung window

A home owner from Kamas, Utah says:
Hi. As you can see in photos the cord on both bottom balance mechanisms have failed. These are 28 inches overall length, 9/16" two pulley balances. Please advise as to a replacement part number so i can get some ordered.

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Jasmine from SWISCO responded:

Thanks for writing in! Your balances remind me of the Series 751 Channel Balance with a 15-014 knife lock shoe. Specifically, you'll need the S751-28.

Unfortunately, I am unable to cross-reference the stamp from your balance to determine the stamp option you'll need. With that said, you'll need to obtain the exact weight of the sash. 

There is a chart below the product description of the S751-28 balance that lists the weight ranges each stamp option can support. If yours does not fall between any of the listed weight ranges, this will need to be a custom assembly. 

Please let me know if you have any questions.

How to install a ribbed tilt channel balance with knife lock shoe
How to install a ribbed tilt channel balance with knife lock shoe
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