I cut my rear metal brackets with tin snips and fit 6.5" Fosgates back there, at one time. I decided to try and fit 6x9" Infinitys... and I blew one. Now, I need to order a couple new metal brackets. As soon as I do, I'm modding them and putting some 6.5" Infinitys (same as the ones in my front doors) in those suckers. They handle more than the 6x9's did, and they sound great.