93 Topaz: car stereo (AM/FM) removal and replaced with AM/FM cd player from my 94 Mazda protege (Sony EXCD-406). I would like to replace the AM/FM stero (working fine) with the CD player/AM-FM stero. Need to remove the old one first, appears that I need a special tool, although I've heard you can use a coat hangar (bent to appropriate shape). Please provide details to help me change stereos.