alcloa window replacement

A home owner from Sidney Ohio says:
Im looking for replacement parts for older alcoa windows. Can you help?
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Bob from SWISCO responded:

Thanks for posting. Please confirm that the metal channel, not including the end attachments, is 15" long. If so, see either our S351-15 or S390-15 . The only difference between these two balances is the 'depth' of the bottom nylon fitting, so compare both with your old hardware to see what matches best. You will need a stamp option of 1440. If the balance is a different length, or you have any questions, do let me know.

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