I have a 07 impala with a base level stereo that I upgraded and am no longer using if you want to buy it from me? I went with a used Sony android auto head unit that I got off of ebay for $200 and it looks pretty stock. Honestly I would recommend going with an apple car play or android auto though and just streaming music through your phone. This would also include google maps on your head unit screen, rear camera if you decide to install one, google assistant to make/receive calls, and send texts. Install is a little involved though and you have to buy a $100-$150(i don't remember) module if you want to keep your steering wheel controls and onstar but it’s pretty much match up the colored wires, plug in the connectors and your good to go.