How do you go about finding speakers that will be the EXACT fit for your vehicle without any fabricating whatsoever? I would like to install them myself this time and I just want straight bolt ons. Ive also heard 2 different sizes for the speakers in my vehicle and was wondering if there is a site to find out this kind of info, or if there is anyone here with this kind of knowledge I would greatly appreciate it. BTW, my ride is an 04 Nissan Xterra.