Replace sash balance on Anderson windows (Narroline ?)

A quick learner from Newtown, PA says:
Hi,the sash balance cords broke on an Anderson window. I think it's a Narroline. Do I need to first get the part number off the old sash balance before ordering new ones? Also, are the plastic jamb liners available?

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Tom from SWISCO responded:
Thank you for posting! Could you send in some photos to help us better identify the problem and find a solution?
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