Both Balance coils on sash window broken

A quick learner from San Francisco says:
January 26, 2019
Both Balance coils on my sash window broken. Not sure about the coil lb size. Thre's a part number on the shoe: 5.704,165
The size of the sliding part of the window is
27"w by 20"h. The width of the shoe is 1.25".
Thank you for your help
Profile picture of Paul
Paul from SWISCO responded:
January 29, 2019

Hello there. We offer a similar coil balance set up. Start with looking into the 15-177 coil balance shoe. It's 1-1/4" wide. The coil spring is screwed to the coil balance shoe. We believe your estimated window sash weight is 12 pounds, therefore, we think the S152-6 may work. Look it over and let us know if you have any further questions. 
Coil Balance Shoe, Slate Blue
Coil Balance Shoe, Slate Blue
15-177
$3.47
6 lb Series 152 Coil Balance
6 lb Series 152 Coil Balance
S152-6
$4.80
#6 x 3/8 SS Pan Head Screw
#6 x 3/8 SS Pan Head Screw
33-071
$0.21
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