Besides the lip, they are an exact bolt on. All the holes line up the same as the escort ones. The only actual difference between the lights is the light housing itself. The frame/adjuster is the same as the escort one.
Actually, the Tracer headlight brackets are slightly different where the grill pops in, but as long as you use the accompanying Tracer grill, it is not a problem. The Tracer grill´s "legs" reach farther back toward the radiator, so the headlight bracket attachments are "flatter."
On the subject of headlights, I am absolutely diggin´ my BMW units. Man, the difference between these and the stockers is, pardon the pun, night and day. In combination with my Camaro high beam driving lights, I have some candlepower. YEAH!!