Mate i'm not too sure but jack up the car and have a look around underneath (BE CAREFUL) the front spoiler where the foglights are mounted and you might find some sort of adjustment mechanism there. If not, take your car down to your mechanic and have him adjust it for you - he should have the sketches on a wall that shows him the right angles for the lights. If he charges you for that tell him to go to buggery!
Also try the E36 forum too, they might have a better idea.... Good luck