Channel balance for Milgard window

A home owner from San Diego, CA says:
Please help identify the replacement part number for a channel balance with the following marking and dimensions:

20. 4. JU. CMC. 7

21" L, 5/8" W, 5/8" D

I am sending a sample.
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Paul from SWISCO responded:
Thank you for sending your sample. After carefully reviewing your hardware, I recommend our S385-21 channel balance with a 2040 stamp option.
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