Side load channel balance

A home owner from California says:
July 11, 2017
I have a non-tilt window that I would like to replace the balances on. The balance is 15" long and 5/8" wide. The number on it says 14 5 LO CALDWELL. Which part number do I need? Thanks!
User submitted photos of a window balance.
A home owner from California says:
July 11, 2017
To clarify, the back side (solid side) of the channel is 1/2" wide. The front side (open side) is 5/8". So it is tapered.
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Paul from SWISCO responded:
July 14, 2017
I recommend our S390-15 with a 1450 option, I think this can work for you.
15" Series 390 Channel Balance
15" Series 390 Channel Balance
S390-15
$9.34
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