SWISCO - The Replacement Hardware Authority

Searching for c136p23674

A quick learner says:
Looking for sash balance for 1974 Andersen 20" x 36" Double sash. Part is marked c136p23674 and measures 23/4" x 6".
Picture could not be uploaded and you can not read the number on it anyway. Take my word for it, this is the number on it and there are no other numbers.
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Tom from SWISCO responded:
I think the key number is "6p23." Can you confirm that this particular number is printed differently than the rest? This is an important detail. If so, I recommend our 24-637.
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