Channel balances for Caldwell windows

A home owner from escondido, ca says:
I need 4 replacemnt window balancers. Single Sash, non-tilt.

Code on current balancer is 21-4-gp-Caldwell

Metal is 12 15/16 in length and 9/16 wide.

It appears similar to your S385-21.. How do I verify the plastic ends are correct?
A customer submitted photo of channel balance attachments.
Profile picture of Tom
Tom from SWISCO responded:
Thanks for posting! Before we confirm the measurements of the attachments, could you please double check that 12-15/16" is the length of your metal channel? It isn't often that a channel would measure unevenly like that, and I just want to confirm whether or not we will have to make a special order.

As for the shoe, please refer to the following chart and match your bottom attachment to one of the four listed.
A SWISCO guide to identifying balance shoes.
A home owner from Escondido, CA says:
I mistyped the length of the metal channel, its 21 15/16 not 12 15/16

The attachment has wings and appears to match the 15-004

Profile picture of Paul
Paul from SWISCO responded:
Thank you for the information. I think that our S385-22 Channel Balance will work for you. You would want that wit a 2140 stamp option, as well.
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