Balance identification

A home owner from USA says:
I need 4 balances .
1/2 inch wide
5/8 inch deep
30 inches long
Pictures of ends included below:
User submitted photos of a window balance.
Profile picture of Donna
Donna from SWISCO responded:
Thanks for posting with photos! This looks like our S380-30, Channel Balance. Compare it to your sample and look for the stamp on your original balance.
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