That console is spec'ed as using "DIN" mounting. That's typically the cage-type installation. ISO-DIN would be where the radio bolts to rails on the side. That's not to say there isn't a strap with a bolt going from the back of the radio to the console somewhere inside, though. However, I would try to key it out before removing the console. I tried searching for a picture of the keys, but came up with nothing. Remove the faceplate, then gently pry off the trim ring around the radio. You will see the flange of the cage. There will be gaps in the cage on the sides of the radio, halfway up the cage. You need to slide a piece of flat stock into those gaps and lift the radio out. The flat stock will release the barbs that hold the radio in place. You'll probably have to use a pick or something to hook the radio in the CD slot to lift it up. If you want to reuse this radio, be gentle! If you feel the barbs release, but still can't get the radio out, then it's probably bolted in from the back, and you will have to remove the console.
Some older Sony's had the keyholes near the corners on the top and bottom of the radio, but it's doubtful you've got one of those. I haven't seen them in a long time.
The other option would be to go by a local stereo shop or Circuit City/Best Buy and ask them if you can borrow the installation keys for that radio. They should have some back there and be happy to lend them to you. This makes removal much easier, as they have provisions in them to lift out the radio when it releases. You just push them in until you feel it release, then pull up.
If you pull the trim ring and see no cage around the radio, then you've got an ISO-DIN mounted radio. Pull the console, that's the only way you'll get it out.
