milgard replacement balancer

A home owner from portland oregon says:
need part number One of the windows balancer cords broke. stamp on balancer shows 20 4 FQ. Balancer measures 22 inch including plastic part

window is a milgard brand

thank You

User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
Can you confirm the length of the metal channel? Based on your stamp, it should be 21", not 22". That said, I would recommend either our S380-21 or S385-21, depending on the size of the bottom shoe.
A quick learner says:
Thx for options. I have gone with the 385. Metal channel length is 21
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