Channel balances for non-tilt single hung windows

A professional from USA says:
Hello! We need 4 of these balances for now. They are channel balances for non-tilt single hung windows.
Balances are:
1/2" wide
29-1/4" long (measurement of metal only)
pictures attached to figure out which series (I have more pics if you need them).

User submitted photos of a window balance.
A professional from USA says:
Can you please tell me the approx turn-around time for these including shipping? Thank you!
A professional from USA says:
I forgot to mention: They appear to be stamped with 28 1/4 3 C H
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.
Comparison of <a href='Channel-Balance-Shoe/pd/Replacement-Sash-Support-Channel-Balance-Shoes/15-001'>15-001</a> & 15-002
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