Ok, the holes on the bumper are usable. I recomend drilling out holes on the spliter so you can have more support for the spliter! The actual holes on the spliter are for the evo3 under tray, you can get the part # off of www.e30m3performance.com .. I got teh evo undertray and drilled the holes from the bumper and I was happy, until I broke the spliter in half on a curb in a parkinglot! I am waiting to mount a carbon spliter as soon as I can get a new rear wing for a matching rear carbon wing!