Lauren from SWISCO responded:
July 5, 2023
Hello, thank you for posting, It appears that you have an older version of the 15-251 single support, though you'll need to remove the assembly from the window to confirm there is just one coil spring per each side of the window sash. If the assembly only uses one coil, based on the number stamp take look at the S160-10 coil that is compatible with this support. This coil is a 1/2" thick, please compare to your original to confirm a good fit! One coil on each side of the window will support a 20 pound window sash overall. You'll note right away that the 15-251 is much longer than your original support, but it will still work just the same. If you need a new bracket, you may have a style like the 16-032. If it differs, please let us know and send us a picture of the original to further review. Please review and let us know if you have any additional questions. Measurements of 15-251
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