20 5 IQ Caldwell Window Balance

A professional from Sherwood Oregon says:
I need 2 window balances for for my vinyl milgard windows from 97'.
the Balance is 21" not including the attachment pieces. It's a 3'x 4' Single Hung. I am a glazier by trade. Could you please help me locate the type I should get for this. Thank You for your time.

Chesley
User submitted image of their window hardware.
Profile picture of Paul
Paul from SWISCO responded:
Hey, Chesley. Always happy to help. See our S385-21 channel balance with a 2050 option. I think this looks like a good match but let me know your thoughts.
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