i already have seperates in the front, and own a set for the back. I was just thinking of getting some non-seperate coaxials for the rear so it would be better than stock, but still fit. I just didn't know if there was physical space for the crossover (~2.5"x4"x1") in the rear pillar or behind the trim panel, cause if there isn't then installing seperates isn't an option and ill sell them and get something that will actually fit.
maybe some of those panel seperates from kenwood. Its a 5" speaker and a tweeter in the shape of a 6x8 so it will bolt in. without taking up more space.