A "Good enough" model of the Seimitsu PSL-30N illuminated arcade button - Based on the real-world model of this button as the drawings available online are insufficient.
I've partially modeled where the cable plugs into and what I consider to be "enough" room for it to flex.
The LEDs each have a 120ohm resistor, and draw 42ma each. This means that an illuminated button will draw 84ma. You don't need to supply your own resistors. Simply provide 5v to the red+/black- wires!