Casey from SWISCO responded:
February 1, 2024
Hello, I can't be sure with the hardware still installed but your pivot shoe resembles the 15-140 at first glance. I would recommend removing yours from the window to compare to the dimensions below. If it's a match, see the S150 coil springs and related parts that work with this shoe. There should be numbers stamped on the original coils that you'll need to choose the corresponding strength options for your replacement coils. Take a look and let us know if you need anything else. Alternate image for 15-140
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