Thanks Doug. I have received my radio and four "box" speakers. All of the components include mounting brackets, and are quite small. I test-fitted them to the car. I placed the front speakers under the parcel shelf, and the rear speakers under the rear seat. I located the radio to the far left of the underside of the parcel shelf. The speakers are nicely hidden, and the radio face is small enough to be unobtrusive. I've also ordered an inside mount radio antenna.
I hooked up the system on my workbench and operated it. It's not concert hall quality or volume, but I think adequate for the purpose. Here's a link to the box speakers.
http://www.amazon.co...ailpage_o00_s00