Anderson Window sash balance

A home owner from Franklin park, NJ says:
Hi my name is Steve and I was wondering if you can help me with this part. I believe it says BP2412#31 10-86
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Casey from SWISCO responded:

Hi, Steve. With an Andersen sash balance stamped with "12#31", our 24-1231 sash balance box will be able to replace it. Take a look and let us know if there is anything else we can help you with. 

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Casey from SWISCO responded:

Hi Steve. Welcome Back. For your sash balance marked with "9#27", our 24-939 will be able to replace it. 

A home owner from Franklin park, NJ says:
Hi Manuela, I also have another Anderson sash balance stamped with E38 9#27 3-86.
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