Replacement balance for Atrium brand window

A home owner from Tucson, AZ says:
I need a replacement balance for an Atrium Window Company brand window. The balance is a 1/2" non-tilt that is 17" long. The codes on the back of the balance read: 16 4 IV CMC 7.

After looking around the site, I think I need the S380-17 stamp option 1640. However, based on the measurements and pictures on your website, the balance top that looks like the best match is the 19-005 while the shoe looks to be a 15-001.

The S380 seems to come with 19-005 and 15-005, while the 15-001 comes on the S390, but with the 19-002 top.
Can you guide me to the appropriate part?
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
We can help you replace this balance. The series you need is the 395 channel balance. Specifically look at the S395-17 with the 1640 option. Let me know if you need any help.
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