anderson window sash balance

A contractor from Westport, MA says:
we need a replacement part for 11600-2.

other numbers located at the other side are;
E53 9#27 5 83

purchaesed around June 1983
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Donna from SWISCO responded:
Good Morning,

Please take a look at the Swisco 24-939 Replacement Sash Support Andersen Window Balance.
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