Need box for a 06 Frontier Crew Cab

[bad03ranger]

I need a box for a 2006 Nissan Frontier Crew Cab, think im going with two 1508s so i need about 2^3

i may try to find a prefab and do aeros in it but cant find a box big enough that will fit under the seats.

Any help on this one? Design or a place for a prefab.

[rosshimself13]

supercrew (http://www.supercrewsound.com/commerce/product.jsp?prodId=127&catId=55) is the only decent one i have found, but not big enough for my tastes