This is something for all who are not purists. Found this on web and am putting in my 55 Ford.  If you are not wanting something in glove box or under dash, or other places that just seem to be only solution to a modern radio, AM/FM/Bluetooth and USB ( for mp3 thumb drive, charging ).  Without paying those high prices this might be four you.  
Its a Boss MGR 350B marine radio, 6" X 9" Dual Voice Coil Speakers or use 6" X 9"  with 2 4" speaker mounted on it.  Speaker bolt under das to replace original.  Take out stock radio, use the benzel from around radio and wire in put rear speaker in if you wish in original hole in back and done.  If you aready have a pair of front and rear speaker cut in from your other radio they will plug in to this radio.  This is a 12volt hook up, and in place of push buttons I used dices the person i got this from just used blank plate.  Use you own idea, which could be endless.  
I like it and looks good, not cutting up panels and modifying brackets, and mounts.
Radio cost $80.00 If you want to spend more for Jensen,and other big name they also make this radio style.  Do Google search for marine radios.  Speaker cost $48.00 again other name brand cost differ.

This fit the round hole without any problems. Replaced the push button with dice the dice had to be shave a little for the fit, but you can do other ideas of your own. I also replaced the front speaker with a ( dual voice 6 x 9 speaker ) this allows for left right and better sound and did same in rear. Sound great and looks awesome.

Thanks, I think I'll try it. Last time I tried I took the push buttons of an original style radio (I had two) and it fits right in and looked like push buttons. I saved it when I put the other radio back in. Currently I have a one single speaker in the dash and two in the back. Think it will still sound good? I don't want to fight putting another front speaker back in.  Once I get it in I'll post a picture. 

Check online for a speaker that will fit where the factory speaker is but give you 2 channels for stereo sound.

Y's guys rule!
Looking for McCullouch VS57 brackets and parts. Also looking for 28 Chrysler series 72 parts. And early Hemi parts.

MoonShadow, 292 w/McCulloch, 28 Chrysler Roadster, 354 Hemi)
Manchester, New Hampshire