once you purchase a set of speakers from us, we'll be sure you obtain the wiring harnesses and mounting brackets you need for your auto. They're available for most cars. absolutely free lifetime technical help The 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