Sash window balance

Quick Learner from AZ
I am trying to install new sash window balance. My current one has markings saying 27 4 FW CMC 4. Which part number should I choose?
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Bob
Bob from SWISCO
SWISCO
Expert

Thanks for posting. This looks like either a S351-28 or S390-28. The only difference between these two balances is the 'depth' of the bottom nylon shoe, so compare both with your old hardware to see what matches best. You will need a stamp option of 2740.

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