Caldwell channel balances

A home owner from California says:
I need 6 as in the pics. They are 27 inches on just the metal channel. Channel OD measures at 5/8" wide. I also need 2 with the channel length is 15" Longer one are marked 26 3 40 Caldwell. Shorter is marked 14 2 40 Caldwell. All end hardware/fittings are identical. These are from Mercer windows installed in 1996.
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Emily from SWISCO responded:

Hello there!

Thank you for reaching out to us. I recommend either our Series 380 or Series 385 channel balances. You'll have to measure as shown below to determine the best match. I also recommend the 2630 option for the 26 3 balance and the 1420 option for the 14 2 balance. 

Comparison of the S380 and S385 balance shoes.
Comparison of the S380 and S385 balance shoes.

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