Tom from SWISCO responded:
May 1, 2023
Hello! If the top and bottom guides match those included with the Series 351, then the S351-18 would be the most likely replacement assembly. Your older style stamp of "17D" usually matches our more modern 1740 option, but weighing your sash is the best way to confirm. You can do this by removing the sash from the window and placing it on a scale. Any common bathroom scale will do. |