Anderson window balance

A quick learner from 11731 says:
I need a replacement Anderson double hung window balance and the only visible marking says 11600-17

The visible glass dimension is 32-3/8"W x 20" H (each pane)
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Paul from SWISCO responded:
Based on your glass size, I think our 24-939 might work for you. There should be more stamps printed on the balance box itself, perhaps on the tab, which would allow us to confirm if the 24-939 is correct.
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