Alright so I've already read several articles about the actual size of the speakers and how the front are 6 by 9 and then the rear ones are six and a half. But there's a couple different posts that say that certain speakers won't work because of the depth of the actual holes and mounts for the speakers, but I've yet to find anybody actually say how deep the speaker holes are. I've looked up a couple of different websites with different speakers that I want but all of them so far said they're not compatible with the Challenger and I would assume is because of the depth, or maybe the websites are just wrong. Does anybody know how deep the holes actually are so when I'm looking at speakers I can actually factor that into it? I really don't want to spend a lot of money on speakers and then it turns out they don't even fit, or I have to do some crazy modification like drill a hole or something like that into my car which I refuse to do for some speakers. I've got the 16 RT with the base level speaker package.