The widest part of my box is only roughly 8 1/2 inches, but the rest of the box is 7 3/4". It does come about 1/4" away from the stick in 4th gear though. Two 8W3's would fit in the middle with ease. They are very small subs, with only a 4.3" depth I believe. A fiberglass box painted to match the truck would look pretty badass!