This is a remix of https://www.thingiverse.com/thing:1342480/ 

This model includes non-keyed (rectangle) and keyed (a cutout that makes socket to be inserted only one way).

I removed all of the code that wasn't directly related to iec mount, then did a few prints until socket fit into sample part well enough.

The thickness of a wall between socket clip and front panel is 0.8mm (non-keyed) 1mm (keyed). The thickness is customizable, measure it on your socket with calipers first.

This design is not supposed to be used by itself – it is the shape of a hole to be made in other OpenSCAD designs.