10 or 12 inch.... It has to be SHALLOW MOUNT cause the truck is a reg cab please help

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l have a 94, & l had to build my own box. l do not know how far back u have the seat, but if it is all the way back or just 1-2 clicks forward u will have to build ur own too because, sorry to say it, but nobody makes sub boxes that small. There may be room under the driver is side of the seat for a downfiring box, but u will only end up with one because the computer is under the passenger is side. l ended up getting two of these :http://edesignaudio.com/product_info.php?cPath=1_21&products_id=106 & mounting them behind the seats. They're awesome little subs & they're only 3 inches deep. Pioneer is the only other company l know of that actually makes quality shallow mount subs but u will pay an arm & a leg for them, & in reality, the performance just is not that much better. l am not badmouthing Pioneer, but it is just a matter of how much sound a sub with that little clearance can actually produce. Sorry, l guess that got a little longwinded but hope it helped!