Searching for Anderson Corp 519 dash balancer

A quick learner says:
Anderson Sash Balancer

519
J51 ?
11600-17
11600A-3

4 89


CAN YOU POINT ME TO REPLACEMENTS? Please?!
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Lauren from SWISCO responded:

Hello, thank you for posting,

Please review the 24-531 Andersen Sash balance that is used to replace balance boxes marked with the number 519. Let us know if you have any additional questions! 

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