sash balances

A contractor from Maryland says:
I can't find this part can you help me ?I can read this information Andersen Corp BL23 10R 10-85
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Paul from SWISCO responded:

The replacements for your Andersen Narroline window should be the 24-11R (right side looking from the outside in) and the 24-11L ( left side looking from outside in). Look over  both parts and let us know if you have any further questions.

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