SWISCO - The Replacement Hardware Authority

channel balance for non tilt window

A quick learner from north Hollywood, California says:
Non tilt window
Length 22"
width 1/2"
Weight range 13-18 lb
Stamp on channel balance reads " 21 3 HL caldwell"
In need of two, I looked at tops&shoes and not sure which one fits beat

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 351 or our Series 390 balances.

Now, as you can see, there is only one difference between these two Series, and that is their bottom shoe. The Series 351 uses the 15-002 while the Series 390 uses the 15-001. 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.
15-001 and 15-002
A quick learner from north Hollywood says:
Thanks:) I now know which bottom I need 15-001
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