The newer radio bezel does not allow a aftermarket HU. You will have to buy a new bezel kit. The harness is simply a piece where one end plug into the factory HU wire clip and the other end is just color coded wires. You will then tie your new HU to these wire. This basically just makes it so you don't have to hack up the factory wires. As for the steering radio controls, once you put in any new head unit, they won't work unless you buy another adapter like Parrot. I never used or install one of those so someone else will fill you in on that.
YzGyz
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