take covers off on a friday and take them to a car hifi shop tell them what they out of and they will find a speaker set that will go straight in to without having to do any mods.i got a set of pioneers for rear wall in my old daf cf as the holes where there and speaker wire was taped to wall.so all i did was measure the width took it in they show me what was good.i choose pioneer over anything took 20 misn to install.