Just a word of advice, any subs you put in the trunk of a roadster will most likely disappoint you. There is just far too much material in between the trunk and the seating position to ever hear anything. You will be able to feel a little vibration when the top is up, but it's just not going to work. You are far better off fitting whatever 6.5" subs you can in the factory locations. Profit from my mistakes, been there done that.

These Kickers fit fine with a 1/2" spacer ring. They will surprise you with their output if you give them a decent amount of power. I am running two on a Crossfire Audio XP6004 4 channel amp along with components in the doors of my roadster and it sounds incredible.



http://www.crutchfield.com/S-T0Yz8s6...8C65VT4&tp=972
(if you look around a little, you can buy them for about half that Crutchfield price)