Need sash balance for Andersen window

A home owner from Adamstown, MD says:
Hello, I need replacement sash balances for this Andersen window. I believe it's a 200 series Narrowline and I need the 837. The bottom sash measures approx 28.5"W x 24"H.

Thank you,
Paul
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Bob from SWISCO responded:

Hey Paul. Andersen balance replacements are most reliably determined by the stamp codes on the old metal box. If you mean that there's a stamp of '837' on the balance box, then our 24-837 would indeed be the right replacement. If not, you'll need to remove the balance box and show us all the stamps on its surface. A specific clump of numbers should determine the replacement you need. 

You can read more about Andersen sash balances, as well as see a video that details how to replace them, here.

A home owner from Adamstown, MD says:
Hello, I attached new pictures of the numbers stamped on the balancer. Which ones do I need?

Thanks,
Paul
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Casey from SWISCO responded:

The (7#27) stamp on your balance would actually be replaced by our 24-737 Andersen sash balance. Take a look and please let us know if you have any other questions. Thank you!

A home owner from Adamstown, MD says:
Thank you!
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