Replacement for Unique balance 21C

A home owner from USA says:
November 3, 2016
The spring inside one of our channel balances broke and so I'm looking for a new channel balance to match the one we currently have. I included 5 photos of the current balance. It's 22" not including the plastic ends. The names and numbers on the back bottom of the metal channel are:

"23:08:05 05/18/04 UNIQUE BALANCE 21C"

Hope that helps, let me know which of the channel balances you have for sale will match mine.
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
November 8, 2016
Please see our Series 390 channel balance, I think this could be what you're looking for.
22" Series 390 Channel Balance
22" Series 390 Channel Balance
S390-22
$9.59
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