I dont think i need the box for mine...what factory stereo did you have?I installed a Pioneer AVIC D-3 (double din) in my 07. I bought a bezel from the dealer for a truck equipped with factory navigation. Once you have that you need an installation kit - I used a Metra. Then you need an antenna adaptor(Metra) and a interface box - Peripheral Electronics. The box gives you outputs for VSS (vehicle speed), lights, reverse and basically makes the job easy. The hard parts are rounding up the components - one hour install. Sounds more complicated than it is!