anderson sash balance

A quick learner from md says:
the lower glass is 28.25 wide by 23.75 high (could be 23 7/8 high)
which Anderson sash balance would I need.
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Paul from SWISCO responded:
You could possibly have our 24-837, but I cannot guarantee that it's a match. The only way to know for sure is to remove the balances from the window and see what stamps are printed on the box. If I knew those stamps, I could be more confident in my recommendation.
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