Remixed from the original because I needed a slightly different gap between the bed and the frame. Four different heights provided, plus the OpenSCAD file so you can modify if needed.
If you're going to replace your springs with these then you should already be running a working auto-level setup.
Print with supports everywhere.
Material should be ABS to better withstand the heat from the bed (although the corners don't get overly hot, so PLA would most likely be fine).