single hung constant force coil balances

A quick learner from Champaign, IL says:
July 8, 2022
I need to replace the coil on both sides of a single hung window. Both coils are broken.
Window sash weighs about 13 lbs and is 23.5 inches high. Probably just need coil replacements. Coil is 1/2 inch wide. Looks like Series 175 silver. Shown in the picture are the bottom shoes and the broken parts of the coils on the upper brace.
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Casey from SWISCO responded:
July 13, 2022

Hello,

Your pivot shoe looks like an older version of the 15-180. This shoe is compatible with the S190 coil springs and other related items on both product pages. Take a look and thanks for posting! 
740 S190 Coil Balance Spring
740 S190 Coil Balance Spring
S190-740
$9.74
Coil Balance Shoe
Coil Balance Shoe
15-180
$3.97
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