Coil balance spring

A home owner from Franklin, Tennessee says:
August 8, 2020
Hello. Can you please help me identify the proper replacement coil balance springs for my windows? They measure 1/2 inch wide and are Bronze in color. There are two springs per window, one on each side. The windows weigh approximately 22 pounds and are approximately 38 inches tall by 30 inches wide. Thank you
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Bob from SWISCO responded:
August 12, 2020

This looks like our 15-180 Coil Balance Shoe, which uses Series 190 Coil Balances. If a window weighs exactly 22 lbs, you could use on each side of the sash a S190-540 5 lb spring and a S190-640 6 lb spring. This equals 11 lbs of support on both sides, for a total of 22 lbs overall. Let me know if you have any other questions. 
Coil Balance Shoe
Coil Balance Shoe
15-180
$3.97
540 S190 Coil Balance Spring
540 S190 Coil Balance Spring
S190-540
$9.74
640 S190 Coil Balance Spring
640 S190 Coil Balance Spring
S190-640
$9.74
Double Support Detent Clip
Double Support Detent Clip
15-181
$6.17
Balance Bushing
Balance Bushing
15-182
$1.80
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