Paul from SWISCO responded:
June 13, 2017
Thanks for contacting us. Please see our 16-024 mounting bracket and 15-087 coil housing pivot. These appear to match the hardware I see in your pictures. I would also recommend our Series 180 coil spring. You will need the number printed on your old spring to determine the best Series 180 option.
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Paul from SWISCO responded:
June 15, 2017
With a mark of 729X, I would recommend our S180-7. Each of these springs can carry 7 pounds, so if you have one on each side they would be able to support a sash weighing 14 pounds.
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