That would be rare now. Out of the 5 z31's I've bought, only one had an original radio: which did not work. (radio or tape deck) You may have to (like my self and many others) make a trim piece that goes around a new radio/cd player. I would recommend to find a radio/cd player to suit the car. I personally found (new off eBay a few years ago) a Kia Rio's AM/FM CD player that looked the part. It has usb and blu-tooth phone capabilities too.
Thank you for the feedback. We are going to restore the car back to original, Its 50 anniversary with full life history, top condition, just need the radio, working or not dosent matter. Also missing one T-Bar internal cover.... Thanks again.