4 screws in total. Need to find those bodykit shop to fix it for you. You have any existing spoiler? I dunno whether the Ori spoiler fittings is suitable for this spoiler or not, coz my car didnt comes with the Ori spoiler.
I encounter really loud vibrating sound from while accelerating in the rain..the sound comes from engine bay or the wheel...(im not too sure)...BUT....accelerating same place on dry sunny...