Andersen Balancer Boxes 11600-17 and E91 9 27 5 84

A home owner from Blackwood nj says:
Replacement for permashield narroline window. Measures 6 1/2 by 2 3/4 by 1/2. Markings show 11600-17 and E91 9 27 5 84
User submitted a photo of a window balance.
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Tom from SWISCO responded:
Check out our 24-939. This can replace Andersen balance boxes with the stamp 9 27.
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