For your older Concertone ZX700 I recommend using the iRV RV Stereo w/ DVD Player # IRV64FR as a replacement.
This stereo measures 8-1/4" wide x 4-3/8" tall x 7-1/8" deep, is a double din unit that has a built-in CD and DVD player, and also has Bluetooth capabilities so you can stream directly from your smartphone to your stereo. view full answer...