sash cord for Andersen window

A quick learner from oceanside says:
I have an Andersen window and one of the sash cords failed. I want to replace all the cords but I notice I need a number from the original sash cord part in order to order the parts from you. This means I have to take apart the window BEFORE I order the part. Is there some other way I could get the part number? The window is about 30 years old, it is a double hung and it measures about 48 1/2" high by 40 1/2" wide

Thank you
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Tom from SWISCO responded:
Hey, Samuel. Using the stamp printed on the balance box is usually the best way to identify what you have. I know it's frustrating, but that's how Andersen designed them. We could try to figure it out another way, if you wish. Please give me the Height" x Width" of the visible glass for the sash these balances are supporting. We will try our best to identify what you have from there. However, this method is not often reliable and we cannot guarantee that our suggestion is exactly what you have now.
A home owner from Oceanside says:
Hi Tom, the visible glass (both upper and lower) are 36 1/2 by 21 7/8. I'm pretty sure it's an Andersen Perma Shield Narrowline window model # 3442.

Based on that, can you determine which balance boxes I should order?

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Tom from SWISCO responded:
Thanks for getting back to us! If the insulated glass thickness is 3/8" overall, we recommend the 24-939. However if the glass is 5/8", we recommend the 24-1033 instead. However, please keep in mind these are just suggestions. We cannot be 100% sure that they will work for you without knowing the stamp on the old balances.
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