Andersen Sash Balancer

A quick learner from Pennsylvania says:
The number on the balancers (right and left) are the same: E33 9P27 277. Can you tell me what the replacement is. I can not find this part.
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Emily from SWISCO responded:

Hello! Based on your 9P27 stamp, you can use the 24-939 Andersen sash balance. Take a look and see what you think.

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