unfortunately that wont be much help...and it wont
leave you many choices
beginning w/ the 2004 model year the rear seat
set up changed...they added an under seat tray system
and seat bottom AND backs that folded...this change
reduced the behind the seat "space".
at the bottom (deepest) part of the seat theres less than
7inches & at the top (shallow) part theres less than 4 inches.
w/ the exception of some of the NEWER shallow mount
speakers (
pioneer,
jlaudio,
kicker etc) its a difficult (read: CUSTOM)
box...and even that will depend on the size speaker (depth) you
use.
most of the PRE-FAB boxes you have will be for the 99-03 and even THOSE
may not be specific enough to fit the speaker you decide to use.
my recommendation...measure the depth behind the seat, include / calculate
the thickness of the board youre gonna use (to build the box) either
1/2in or 3/4in and then build your own box