Caldwell 26 4 HS window balance

A quick learner from United States says:
Hi! Here are the pictures of my balance stamped 26 4.

Thanks,
Fred
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Paul from SWISCO responded:

Hi Fred. We have narrowed down the possible options to our S380-27 and S385-27 channel balance. Please compare the depth measurement of your bottom balance shoe to each part mentioned. See which of the two your balance is most compatible with. Either one you decide to go with will use a 2640 stamp option. If you need any further assistance, let us know.

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