The circular remote that we installed in the coin tray is a Pioneer Model CD-ME300 wired marine remote. It plugs directly into the Pioneer NEX head unit and comes with a long enough wired cable to reach the "brain". The bass knob is just a standard subwoofer volume control available at any stereo shop. it hooks up between the amplifier (which I installed in the trunk, on the opposite side as the cell phone and CD changer) and the subwoofer located in the passenger footwell. I used the Science of Speed subwoofer box which fits in the space nicely. The stock radio simply connects to the auxiliary input jacks on the pioneer head unit. When you want to use the stock stereo, including the CD changer, you just put the Pioneer in auxiliary mode, turn on the stock stereo and use it as normal. As to the custom cut bezel, if you bring your nav pod and Pioneer touch screen into any custom stereo shop they can cut the bezel and affix the touchscreen to it for a minor charge.