dont remember the size sorry but you will have little clips on the studs holding the rotor on . just bend a couple prongs and you can twist off and twist back on and reuse them . and pads might come with a shim . use it . If they dont save your old one. I got a set that didnt have a shim and would vibrate and sounded like crap . i was lucky and still had my old pads with the shim and no more problems .