How to identify an Anderson Sash Balance without taking the window apart?

A handy person from Oxford, Maryland says:
Hello,

Is there any way to identify the correct pair of sash balances WITHOUT taking the window completely apart? My strong preference would be to only dismantle the window once - when I have the correct sash balances in hand. Please help.

Many thanks,

Skip
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Tom from SWISCO responded:
Hey Skip - Thanks for choosing SWISCO.com. The best route would be to show us the entire balance. We need to see the shoe and top, so we can determine what you need. Please send us photos of what you have along with dimensions, and we can go from there. Thanks!
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