I was thinking of getting some Alpine type R component speakers all the way around in my NON-mach 460 car. Question is I know the front and rears are supposed to be 6x8 or 5x7 wich is the same but what else can fit in there, I was wanting some rounder speakers up front and wider ones in the back, would a 6.5 inch work in the same mount? Also how do you get to the rear speakers in the vert? Thanks i appreciate it