Channel balance 26 4 JK Caldwell

A handy person from Kenmore, WA says:

I need few balances for Milgard windows. I removed one of them. Pictues are attached pictures. It is Non-Tilt Window. The channel width is about 1/2". The height of only metal frame of balance is about 27.5" and with plastic attachments is about 28.5". Are these available and how much for two pairs Thank you in advance for your assistance.
User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
Hey, thanks for posting. I've narrowed this down to two possible channel balance Series: either our Series 380 or our Series 385 balances.

Now, as you can see, there is only one difference between these two Series, and that is their bottom shoe. The Series 380 uses the 15-005 while the Series 385 uses the 15-004. I can't quite tell what you have based on your pictures, though. Please carefully compare their dimensions to your own hardware and see which is a better match.
15-004 and 15-005
I also recommend double checking the length of the metal channel. Based on your stamp, it should only be 27" long. Do not include the nylon attachments in your measurement.
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