Stereo install
Actually I have no intention of reinstalling the back seat. It's wrapped up in plastic with a liberal amount of mothballs added for good measure.
I will be fabricating a brace bar to install in the back. The car will get Corbeau seats in the front, the brace bar is where I will mount the seat belt retractors for their 5 pt harness.
The finished exterior width of the box is 41".
The Dart will eventually be getting a full custom gauge panel, and custom center console with floor lighting. I also think I am going to completely redo the underdash wiring when the interior comes out, and replace the crappy bulkhead connector with a cannon plug.