I have this system installed in my 2005 SUT and it is great, the adapters are made by PAC you can go to the web site and get the Part Numbers make sure that your installer gets the adapter with the chime module as all cabin chime noises are played thru the factory radio and this adapter will take the place of the radio chime audio,the adapter also allows ONSTAR to work normally. Additionally you will need the PAC adapter for your steering wheel controls to function, this also is pretty painless to install , a small transmitter the size of a straight pin head will be mounted just in front of the shifter and pointed at the front of the face of the unit to transmit the steering wheel inputs via IF signal to the face of the unit. I can supply pictures and additional info if you need it. good luck!
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