need to replace Andersen Window balances

A home owner from USA says:
Hi, I need to replace Andersen Window balances. Their site says to measure the visible glass and to measure both panes of wooden double hung windows. The bottom section is 36 7/16 wide and 35 15/16 tall. Top pane is 36 7/16 wide and 23 15/16 tall. It's a large double hung window. Which measurement applies? Top or bottom pane? Also can you identify the left and right balances for replacement? Thanks a heap! Catherine
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Paul from SWISCO responded:

Hey, Catherine. Thanks for providing such in depth information. Please give us a little time as we look into this; I believe you have an Andersen Narroline cottage window, which uses a type of balance we don't currently stock. We need to look into whether it's something we can provide. Thank you for your patience!

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Tom from SWISCO responded:

Thank you again for your patience in this matter. Please see our 24-L10-1827 left and 24-R18-1027 right Andersen sash balances. I believe these will work for your window.

How to replace an Andersen Window Balance
How to replace an Andersen Window Balance
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