That is definately not the radio that came in the car. That said, I don't recognize that radio. It looks much like the 210 head unit, but I have never seen a 210 with an in-dash CD, only a tape player.

Most likely your car came with the infamous Becker 1432 two-piece radio and aktive Bazz system. I did a rip-and-replace of the 1432 in my old '93. I found the easiest approach was to start from scratch, so although I retained the OEM speakers and active bass system, I ran all new wiring. You also need an antenna extension, as the 1432 tuner is in the trunk rather than the head unit. There's some discussion of my travails in the archives, lemme see if I can find them...

This is a bit rambling and has some Becker 1492 stuff, but may be helpful: http://www.peachparts.com/shopforum/car-audio-multimedia/208617-94-e320-w124-aftermarket-head-unit-upgrade.html

And... http://www.peachparts.com/shopforum/car-audio-multimedia/207863-1432-dead-what-replace.html

Good Luck.