I have spent a fortune on rebuilding (not me, a restoration garage) my 1960 T Bird. I had problem after problem with the "Q" code engine and ultimately had a 5.0 liter Ford Racing engine installed I bought an aftermarket radio that looks like the original but has modern technology and capabilities. Now I want to add speakers. The kick plates seem to have too shallow space. I don't want ugly speakers in the door. The rear package tray is too slim. I bought under seat speakers but the sound is awful. What do I do?