The hole is the receptical for Euro city lights.
They use the same reflector.
It is the DOT lens that is different [ but close]
What the DOT did do was to have Benz make the USA version lens non iter-changeable with the "E" code one. Just to make sure we late 124 owners could not just buy the Euro "E" code lens and pop it on like you can with the Euros, they cemented the lens into the plastic surround mount. [ the Euros simply screw on]
Sooooo , the 94/95 have "Almost" euro lighting, but to DOT specs. They have the same cut-off , put not as pronounced.
I am surprised nobody has stuck the city lights in the reflector yet.