Need to determine which coil I need

A quick learner from Michigan says:
Coils are stamped with letters EL on one and D on the other, they are 1/2 inch wide, sash weighs 20 lbs. TIA
User submitted photos of window hardware.
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Paul from SWISCO responded:
Thank you for posting. This shoe looks like our 15-177. Do you agree? If so, check out our S152-4 to replace your spring marked with "D" and our S152-5 for your spring marked with "EL."
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