15-175 shoe with broken coil?

A quick learner from Virginia Beach, VA says:
March 31, 2018
I think I need the coil to go with 15-175 shoe. I believe its a single coil and has an f stamped into the metal where it attaches to shoe. the coil is 1/2 in wide.The measurements of the shoe are 1 3/8 x 1 1/4 x 1/2 I guess it would be 9/16 if you include cam.
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Paul from SWISCO responded:
April 3, 2018

I agree, the 15-175 shoe looks like a great match. This is designed to work with our Series 152 spring. With a stamp of "F," I'd go with our S152-6. These springs carry 6 pounds each, so having two on each side adds up to a total of 24 pounds of support. If your sash is around 24 pounds, then this is the way to go.
6 lb Series 152 Coil Balance
6 lb Series 152 Coil Balance
S152-6
$4.80
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