I think, well its been 3 years since I did my locks and widow switches but I think that they are 3mm. I am not 100% on that but I think it is listed on the instructions what size you need to get.
K&N Intake, FC UDP, SpeedHut Guages, Diamond Plate Mats, iPhone thru DEH-P7900BT Power Bass, GPS, Euro Grills, S2 Lip & Skirts, O-Z Superturismo's, MBRP
FRPP Suspension, SVT Rear Sub-frame.
Totally parted and scrapped.