Need sash balance for Andersen window

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.

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!