Trying to find replacement part

A quick learner from Kenilworth NJ says:
I have an old window and trying to find the right sash replacement. It shows bj9 5#27. 3-87
Thank you
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Bob from SWISCO responded:

Hello there. See our 24-531. This is meant to replace Andersen balances that include the stamp code 527, or 5#27.

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