You have to remove it all if you want to remove the retaining bracket from the stock radio.......
Start by removing the ONE screw which is located under the storage compartment to the right hand side at the back.
Then from the centre consol/arm rest, open it and you will see two squarish indentations. Use a flat blade screw driver here and lever each side up gently till it pops up a bit. Do this gain on the sides of the Gear stick/Auto selector. The rest should then lift out easily. Be careful to un plug the power window, traction control wires underneath first. They have notches in them so they dont just unplug. You have to push a tab in to remove them.
The whole consol area should lift out now. Then locate two screws under the stereo on the sides and undo them. Then at the top of the cosol, gently lever out the cover plate which is only clipped in so it will easily pop out.
Inside you will see 4 screws....remove these....
Now if your car has climate control, the next bit is easy, all you have to do is gently lift the consol frame out and unplug the climate control like you did with the power windows. If you have regular A/C knobs, then this section will remain in place when you remove the consol frame.
To remove the stereo, I have found the easiest way is to get 4 equal size allen keys that will fit into the holes in the corners of the stereo. Insert them and gently apply pressure sideways to remove the stareo.
Thats it...
Hope this helps.
Brett