I have the 300S with RE2 Radio with 8.4" screen and no NAV. Unfortunately, I don't have the Rear Camera either. It appears that there is a MOPAR OEM camera available, but the camera is part of the trunk lid center brake light/button. Where is the camera on the factory unit? isn't this too high? Also, in the factory unity there are coloured grid lines; does anybody know if the aftermarket camera also has these grid markings?