Broken coil spring

A handy person from Cary, NC says:

See picture for description dimensions and weight of sash. No numbers but found warranty page in documentation. Not sure if that's the same window. I need a new coil spring assembly for the left side facing out. Please provide the right part number for the replacement.

Thank you,Terry

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Emily from SWISCO responded:

Thank you kindly for waiting during this busy season, Terry. The pivot shoe appears to match our 15-180 which is designed to work with the Series 190 coil springs. If your sash weighs 20 pounds, you can use (2) S190-540 5 pound springs on each side of the window. This would total 20 pounds of overall support. You will also need the 15-181 double coil support clip with this setup. Take a look at the specifications for these parts and let us know if you have any questions. 

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