SWISCO - The Replacement Hardware Authority

Andersen balance box BJ19 5#19 7 87

A home owner from massapequa ny says:
i have a doublehung window from 1987. i took balance box out of it...looking at the window from the inside the left hand balance box has the following numbers..BJ19 5#19 7 87. IT ALSO HAS 11600-17. WHICH NUMBER DO I USE? ALSO THERE IS A BALANCE BOX ON THE RIGHT SIDE AS WELL. I THOUGHT I SHOULD ORDER TWO BALANCE BOXES??...I ONLY TOOK ONE OUT FOR THE NUMBER. HOW DO I GO ABOUT GETTING THESE REPLACEMENT BOXES?
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Tom from SWISCO responded:
Good afternoon! Check out our 24-531. This Andersen sash balance can replace balance boxes with the stamp 5#19.
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