Ho no good...
To be honest, never removed it on a GP/Evo. But I have one headlight I can make you a pic of the under/back of it if this helps ?
You have 3 screws for the headlight : one top you see bonnet open, one in the front of the unit, under the bumper and one in the middle of unit, under the bumper.
You have to remove the bumper, the headlight is deeper than we can see and go lower in the bumper.
Perhaps you have not to remove all the bumper, but at least big black screws in the front of (where the bonnet close) and for the side of the lights the screws in the wheel arch.
Under the bumper there are some screws for the bumper, too.