U15 11/L 7 89 Andersen sash balancer

A quick learner from Kansas says:
I'm trying to find a replacement. Here are the markings on the case:

U15 11/L 7 89

Hope this helps.

Thank you
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Tom from SWISCO responded:
It does help, thank you! I think you might want our 24-11L. This is commonly used to replace Andersen balance boxes stamped with "11L."
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