Andersen Balance E63 9#31 9-78

A quick learner from new jersey says:
October 14, 2011
I have an Andersen E63 9#31 9-78. I'm guessing 24-939 is the correct replacement. Is that right? Will the replacement fit the existing space without modification?
A quick learner from maryland says:
October 15, 2011
I can identify E54 9#27 68 on my counterbalance. I was wondering of the poplar 24-939 is the correct replacement for this.

Thanks!!
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Mike from SWISCO responded:
October 17, 2011
Try taking a look at our 24-939 Anderson Sash Balance, which is the recommended replacement for the 9#31 balance.
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