I have 2 4channels and crossovers mounted on a plate that is pushed to the front of the trunk, and the sub amp is mounted on the box. I've never dealt with an 04+ but the 97-03's you almost need to put a plate up to give you something to mount to. Now for the rca's yes you only need 2 sets then, but for the price of them, may as well run another set if you want to upgrade in the future.