Anderson double hung from around 1989 - 11600-17 R27 89

A quick learner says:
May 20, 2017
I am looking for a replacement window sashe balance, the only markings I see on the unit are 11600-17 R27 89. I have not removed them yet, these are the only ones I can see with it in place.

Thanks for your help.
A quick learner says:
May 20, 2017
I pulled the other side of the sashe down and the other unit has11600-R2 939 R6 90 stamped on it.
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Tom from SWISCO responded:
May 25, 2017
Thanks for posting! That second set of stamps simplifies matters a great deal. Based on the "939," we recommend our 24-939.
Andersen Sash Balance, 927, 931, 937, 939
Andersen Sash Balance, 927, 931, 937, 939
24-939
$54.20
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