Im going to order some new speakers for my doors tom. but i was thinking about it and since the speakers in the doors were starting to fall apart i was going to replace the two speakers in the back...The only problem is i cant figure out how to get to those speakers...Im pretty sure they are 6x8's but if someone can confirm that and tell me how to get to them. I heard 5x7's can fit too but? Also are they all two-way speakers and should i replace them with the same thing or get 3 or 4-way speakers? Last question...Am i going to have to rewire all the speakers?