Sash balancer

A handy person from Milford PA says:
Need to replace both the right and left side balancers. And I can't figure out the replacement part.
I'm seeing numbers:
419
BB21 1192
1600-17
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Casey from SWISCO responded:

Hello,

Take a look at our 24-431 Andersen sash balance that will replace the (419) stamp on your balance. Thanks for posting! 

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