does anyone know or can point me to an online step-by-step replacement of the component systems? does anyone know the dimensions of the speakers? I'm looking to replace mine with higher end equipment, specifically Kenwood eXcelon KFC-Xr71P, but Crutchfield says it will only fit in the back doors and not the front ones...while the Infinity Kappa 60.5cs will fit in the front doors, and it has a deeper seat. what gives?