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Yes, yes, and no. Trim plate is necessary because the Silverado factory radio is a double DIN chassis and this is a single DIN head. Wiring harness is necessary because, as an aftermarket head unit, no harness is installed. "Plug and play" is unlikely, given the integration in electronics nowadays with vehicle computers. I recommend a professional installation if you have never done this kind of thing before.
Sorry, there was a problem. Please try again later.Hello John! This unit comes the following supplied accessories only: Main unit (1), Remote commander (1): RM-X231 and Parts for installation and connections (1 set) including a trim ring (Collar) (Black, not painted) and harness. We do recommend also to take into consideration the mounting dimensions approximately 182 mm × 53 mm × 102 mm (7 1/4 in × 2 1/8 in × 4 1/8 in) (w/h/d). For more information, please visit the following link: https://docs.sony.com/release//specs/DSXA400BT_mksp.pdf ~Jeannette
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