You can buy these as a kit or the parts individually. The first thing you happen to be going to need is an interior. The metal are more easy to use, but the plastic will not scratch in your pieces. The next tool you'll want is something to remove the old Stereo. Most cars will require a DIN tool, check to see what tool your auto requires before buying. With no DIN tool, you'ren't going to be able to pull your original unit outside that is head.