Andersen Sash Balance Replacement needed.

A handy person from Wexford, PA says:
I'm looking for replacement sash balance for one of my Andersen windows.
Numbers on the sash balance are 17 5#23 6-85 I believe. See photos.
The windows are original to the house- mid 80s.
Any help would be appreciated.
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Casey from SWISCO responded:

Hello,

Your (5#23) stamp indicates that you would need the 24-531 Andersen sash balance for your windows. Thanks for posting! 

A handy person from Wexford, PA says:
Thanks very much!
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