We just bought our son a 2007 base coupe model. It is a project car for him. When we got it the windows were down and the stereo was missing. The previous owner bought it as a project but never had time. We have tested the fuses/wires for the windows and everything has come back fine. We would like to put the OEM stereo back in the car since a shop said that is what is causing the window issue. Using the VIN, the product number for the OEM stereo is a Shaker 500, # 7R3Z18806GA. This stereo is discounted and $1300. Is there a replacement product number that isn’t an outrageous amount? Any other ideas besides putting in an after market system?