I made this to have a single stand instead of having four spacers to mount a chinese L298N H-Bridge module.

The STL file provided is 5mm high and has 3mm screws holes. However, the design is a bit parametric, you can adjust these dimensions. Just open the FCSTD file with FreeCAD, then the 'Dimensions' spreadsheet in the tree view. You can have both the design and the dimensions sheet side by side by clicking on the 'Windows' menu then 'Tile'. Once you are satisfied with your settings, export the new parts in STL. When some parameters combinations are impossible, FreeCAD will either ignore your choice or just crash.

This is an open-source design. Feel free to modify this thing at your convenience.

Good design is hard work, even small donations are welcome.