Datsun 510 wagon
You don't see many of these anymore. Soon most people won't remember that Nissan used to be called Datsun!
Modern radios fit really well in this style Datsun, and there was even enough room for the changer under the glove box
Front or rear doors will accept 6 1/2" speakers, so we put JBL  separates in the front doors for the clearest sound, and Sony X-plod 2ways in the rear doors for fill.
A JBL 200 watt amp under the driver's seat powering 2 JBL 12" woofers in a pre-made band-pass box provides the bass, and this little wagon is rocking!