yeah they are 6X8 all around. i would go with the pioneer TS-A1702C speakers for the front and alpine type S 6X8 or 5X7 for the rear. now before you tell me that a 6.5 will not fit in the doors those speakers come with a 6X8 to 6.5 plate in the box so with that plate it will fit and work great. then all you have to do is find a place to mount the tweeter. the pioneers and alpines are both sold a best buy.
when my memphis 6X8 component speakers blow in my front doors, that is what i am going to replace them with.