what details?
They are fibreglass and MDF, they replace the map pockets - no modification required just unscrew the map pocket and screw/bolt these on. They are sealed nicely and about 0.3 cu.ft each... great for a 6.5" component woofer driver or will even work wonders for a 2-way or what have you.
The midbass clarity and response is much MUCH cleaner and deeper with your woofers/speakers in a sealed enclosure than a free-air/baffled. It did wonders for my set-up.
BUT I am going to start selling stuff from my car, and I am definitely going to try and get rid of the supra. These won't up the value of the car at all but they cost me a lot of money.
150 bucks and you can have them... or else I'll put them up on supraforums in the next few days.
EDIT: here's a picture I just took. They have cutouts for the doorlight, molded to fit under the dash fine, don't interfere with the clutch and the glovebox opens fine with the door closed.
http://www3.telus.net/joseph99/supra/speaker.jpg
One more thing I forgot, these were really built for a 3-way component system, which is what I have right now in my car up front. 6.5" in this enclosure, 4" in stock spot and 1" tweets in the pillars.
For the right price I can include my CDT Audio CL-643 component set and Sat-Net 4th order elliptical crosovers