Need to order channel balance with correct top and shoe

A contractor from Charleston SC says:
Stamp is 36 4 CALDWELL JM

The metal channel is 37"

Bottom shoe is approximately 7/8"

1/2" Channel Balance

Need to know the Series 380 or 385 or other.

Need top guides for this window.
User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
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
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