Looking for window parts spring balance.

A contractor from Aurora,il says:
February 26, 2015
Please help find this part for my window.
User submitted photos of a coil window balance.
Profile picture of Paul
Paul from SWISCO responded:
February 27, 2015
Thank you for submitting images. The nylon cover resembles our 15-150S. If you also need the spring, then consider our Series 160 coil spring.
1/2" Coil Single Support
1/2" Coil Single Support
15-150S
$1.10
4.5 lbs Series 160 Coil Balance
4.5 lbs Series 160 Coil Balance
S160-04
$4.50
Pivot Shoe, 1/2" Thick
Pivot Shoe, 1/2" Thick
15-111
$2.44
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