Andersen Sash Balance

A quick learner from Columbia says:
The glass pane dimension is 28"x28". Both top & bottom sash are the same size. The sash balance motors have the following numbers on them. 11600-16 and R27 931 1 84. I did not measure the size of the balance motors. Could you help with the current Swisco part number that I should purchase? Thank you.
User submitted a photo of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
I think we can help, yes. Based on your stamp of 9 31, I recommend our 24-939 Andersen sash balance.
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