You should have 5.25"s in the rear overhead sound bar. They are easy to replace and unlike the ones in the front doors you can use the new grilles that come with the speakers. I'll just reitterate what everyone else said, watch out for depth. I run JL Audio 5.25's back there and they sound great even with no amp. I am using a different head unit than factory. Also, when you install them you will have to use some new slip on connectors for the spades on the speakers.