Window balance replacement coil

A contractor from Cheyenne, WY says:
October 3, 2023
I am looking for replacement window balance coils for a 34-7 x 34-7 Yorktowne CF foam filled double hung bathroom window. The only number I can see on the coil is #4.5 35". There is also a patent number 4,610,108. I need 1 set of 2.
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Jasmine from SWISCO responded:
October 5, 2023

Thanks for writing in! Your coil balance pivot shoe looks like our 15-111. Carefully compare the measurements to your existing pivot shoe to confirm that this is the right fit.

Alternate image for 15-111
Alternate image for 15-111

he compatible coil spring is the Series 160 Coil. You'll need the S160-4 for your spring marked with a #4.5. The compatible cover is part 15-150D.
Pivot Shoe, 1/2" Thick
Pivot Shoe, 1/2" Thick
15-111
$2.44
4.5 lbs Series 160 Coil Balance
4.5 lbs Series 160 Coil Balance
S160-04
$4.50
1/2" Coil Double Support
1/2" Coil Double Support
15-150D
$1.57
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