i want to put a cd player in, i had one in but it was broke, i tried to put another one in but i noticed the plug piece was different for the back(in the new one)...i clipped the wires and then i came upon a block in the road...clueless...what will i need to purchase? is it another one of those pieces that you plug wires into? and can i get any cd player i want? or does it have to be compatible with a explorer?