Sash Balance for 1980s window

A quick learner from Pennsylvania says:
May 26, 2018
I have a double-hung window from the late 1980s - it is a Narroline and the window lower right side etching says AW 88 /1. Upper window is approx. 23 7/8 inches high and approx. 28 1/2 inches wide. Bottom window is approx. 35 7/8 inches high and approx. 28 1/2 inches wide.

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Paul from SWISCO responded:
May 31, 2018

For your cottage Andersen Narroline window, I recommend our 24-L8-1227 and 24-R12-827. Make sure not to mix the balances when installing. Andersen determines "Left" and "Right" from the outside looking in. 
Andersen Sash Balance, L8 1227
Andersen Sash Balance, L8 1227
24-L8-1227
$54.20
Andersen Sash Balance, R12 827
Andersen Sash Balance, R12 827
24-R12-827
$54.20
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