Ok, I know its been posted a million times, but I am guting my stereo system in my 535. I have a new blaupunkt cd tuner, a set of 5 1/4 component set (twed and mid w/ crossover) for the front, 2 good 300 watt amps. But what do I put in the rear slots??? What will fit, a 5 1/4 is really small. How easy is it to cut the hole and add a say 5x7 or 6x9 good 2 or 3 way.. Had the same setup in my 3 series and it was awsume. I am not a real sub woofer fan, I want clean not boom. Any ideas???? Also anyone got the wiring diagram or a link to one.. thanks