r/h & l/h 19x40 chanel balance 1/2" for alcan single hung window

A handy person says:
need 2 balances 1-- l/h 1-r/h has insulated glass
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Tom from SWISCO responded:
I'm not sure what balance it is you have, unfortunately. Alcan has used a few different kinds over the years. Can you show me a picture of the balance itself out of the window? That will help us get started.
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