I'm desperately wanting a new head unit (current aftermarket one previous owner installed freezes a lot and its very glarey which makes it impossible to use the reversing camera.) I'm such a newbie to all this stuff and wanted to know if I had to get one that is specifically for my car or compatible? How can I check if it would fit? I was looking at the Pioneer Avh-Z5250bt or the Sony Xav-Ax8000. Any help or recommendations would be extremely appreciated!