Andersen Window sash balancer replacement P/N?

A handy person from Clarksville Maryland says:
I have a Andersen High Efficiency Perna Shield window 2862

Double pane installed in June 2004

need the part number and price for right-hand balancer (as seen looking out the window)

markings on the balancer are: 11600A-3 and 11600-17

visible glass size per sash is 28 1/2 x 33
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Paul from SWISCO responded:
Perma Shield Narroline Andersen windows often use our 24-11L balance box. Andersen views the window from the outside looking in.
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