had the same dilema. i put two speakers, 4x6 behind the holes for the power top pump. the only problem is the rear seat muffles the sound. what i also did was i removed the front kick panels, put 6x9's in the air vent hole, covered the back of the speakers with plastic, they fit perfect, then i cut off the back part of the kick panels, put kick panels back on and now i have awesome sound through the vents. while some purists feel that you shouldn't do this, you would never know by looking because the kick panels look as should be. i realize i lost air flow and my feet but who cares, tunes are important when cruzin' for me.