Casey from SWISCO responded:
May 3, 2023
Hello, Take a look and compare the specifications of our 15-199 pivot shoe shown below to yours, which is designed to use either the 1/2" Series 160 or 3/8" Series 165 coil springs. Based on your sash weight, I would recommend using either the S160-9 or S165-8 on each side depending on the coil width that you need. Review these parts and the related items listed on our product pages to your original hardware. Thanks for posting! Alternate view of 15-199
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