1/2 inch Wide Channel Balances

A home owner from Voorhees, NJ says:
I need several window balances but cannot quite identify which series that I need. Can you help?

It is a 21" balance and it has a 2020 marking on it. Please let me know if this helps.

Thanks,
Dan G
Customer image of a their channel balance.
Profile picture of Donna
Donna from SWISCO responded:
Looks like SWISCO balance series 390.
Here is a product code link to get you started, choose stamp option 2020:
S390-21
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