55 inches wide, 17 inches high, 4 inch top depth and 10 inch bottom depth. Those are the max outside measurements with the seats in a normal position. If I have to lose some room or make adjustments I can, maybe only use 3 10's . The reason for the 17 inch height is the rear part of the floorpan not flat, so 17 inches is from the highest point of the floor. The box could be taller, the top depth would just need to be less. Thanks for any help