What rotor are you using? The rotors I'm using came from an 07 van with M14-1.5" studs. I'm not planning on using the M14's, but I believe I am going to upgrade to a 9/16 stud to match the early 14 bolt rearend that I'm going to install. If the rotors centers itself good, you may just get by with longer studs and not have to drill anything out. I've replaced alot of car rotors that had way bigger stud holes than they had studs.
If you feel inclined, you can download the Dorman catolog. They have thousands of different wheel stud combinations.
