Need to replace Andersen sash balance

Handy Person from New Jersey
Hi. My balancers are stamped C21 6#23 885 and I'm not sure which replacement I need to buy. 
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Dave Sr.
Dave Sr. from SWISCO
SWISCO
Expert

Hello,

An Andersen balance stamped with 6#23 would be replaced with the 24-637. Take a look and let us know if you need anything else. Thanks for posting! 

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