i bought a 1999 acura integra with the 2 rear/trunk speakers missing. all thats there are the grilles. i want to buy new speakers but im not sure if the wiring is ready for it to be easily installed. when i open the trunk all i see are 2 wire harnesses on the left and right side. is all i have to do is just mount the speakers and plug the wires into the harness? or is there more that is needed for the speakers to work?