Emily from SWISCO responded:
December 13, 2023
Hi there! Our 15-180 looks like a match though this is 17/32" thick as shown in the image below. You may want to double-check just to be safe! With a 16-pound sash, you can use one S190-840 8-pound spring on each side of the window. We also sell the 15-186 single coil support (sold separately). Let me know if you have any questions! Alternate image for 15-180
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