Use OpenSCAD to create your own customizable model of hanger.
1) Open hanger.scad in OpenSCAD.
2) Edit parameters:
width = 10; // mm width
radius1 = 10; // mm first radius
radius2 = 15; // mm second radius
thickness = 3; // mm thickness
angle1 = 300; // degrees for first radius
angle2 = 280; // degrees for second radius
(try different and see what's changing using "Preview"|F5)
3) "Render"|F6 hanger with needed parameters and "Export as STL..."|F7.
4) Use your favorite slicer to prepare gcode from STL.
5) Print it :)