Peachtree balance mechanism

A quick learner says:
May 8, 2023
I need a balance spring mechanism for a:
Peachtree, double hung, non-tilt window, nominal size 36"x60" total width x height.
My existing balance (pictured below) is 26-1/8" longx5/8"x5/8", and has the markings "3660 EL CALDWELL"
My window sash weighs approximately 19.5 pounds.

I searched your website, but was unable to exactly identify the correct one for my application. Please provide the correct part number.
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Paul from SWISCO responded:
May 9, 2023

Thank you for reaching out to us. Take a look at the S745-26 Peachtree balance with the 25.25-4 option. A pair of balances with this option will carry a sash weighing 20 to 25 pounds. Review the specifications and compare them with yours to see what you think. 
26-1/4" Peachtree Balance
26-1/4" Peachtree Balance
S745-26
$16.90
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