after you purchase a set of speakers from us, we are going to make sure you obtain the wiring harnesses and mounting brackets you would like for your auto. They are readily available for most autos. no cost lifetime https://www.caraudiocoho.com/products/mazda-3-car-radio-multimedia-player-1025screen-123screen-2014-2019-android-100-1920720-octa-core-6-128g-andriod-oem-system