THE SIZE OF THE FACTORY DOOR DRIVER IS A 6 1/2" IT IS A 2 OHM SPEAKER THAT YOU CAN ONLY GET FROM THE DEALER...IF YOU WANT TO GET AN AFTER MARKET SPEAKER,(THAT YOU ONLY CAN GET IN A 4 OHM! )YOU WILL NEED TO REPLACE ALL THE SPEAKERS AND GET AN AFTERMARKET AMP TO REPLACE THE FACTORY THEN YOU WILL GET THE SAME SOUND OR BETTER THEN FACTORY DEPENDING ON HOW MUCH YOU SPEND...IF YOU NEED HELP TAKING THE DOOR PANAL OFF LET ME KNOW....I THINK YOU SHOULD GO TO A LOCAL AUDIO SHOP FOR INSTALL......