Are these factory fitted w124 speakers? I got this car used so i have absolutely no idea what the previous owners did to the car. I read that the original speakers are 120 mm in size but the speaker that's currently in the dash is 110mm. I'm looking at changing the speakers in my dash and i'm interested to know the options available. If i were to place a 100mm speaker in the dash, would i need some sort of bracket? Is it possible to fit 5.25" inch speakers with some cutting?