Sash replacement for Anderson Window

A quick learner from Leechburg, PA says:
Hello! I need the sash replacement for an Anderson Window. The windows were part of our newly constructed home built in 1986. The numbers are very difficult to read. I did get 11600-17 and it looks like the other number is 31?5?279-35or6. The visible glass size is 16 7/16 X 21 15/16 in each of the two double hung windows. These windows do NOT tilt in for cleaning. Thank you so much!
User submitted a photo of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
Hello! Based on your stamp of "5 27,," we recommend our 24-531 Andersen sash balance.
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