I know that Metra is bound to make some kind of harness for you. I think one of their units is the CTHO-03. Some people on the other forums have had luck with this one on 2008s, but not 100% sure if it will work for you. Best bet would be to call Metra and order direct from them.
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I laced the unit head with the alpine iDA-x001 and a dedicated xm radio tuner. Then i put alpine type r 6 1/2" in the back on the soundbar and alpine type x 6 1/2" component speakers in the front all running off a 4 channel type x amplifier. Then in the back i have two alpine type r 6x9 running off an amp not yet purchased and a 12"type x subwoofer having its own 1000 watt mono type x amplifier. Phewww all done. thats it
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