Behind the wheel arches there is a hole on the left is 12" tall x 15" wide by 56" across to the other side (right). Also on the right side, there is a really small hole above the floor about 12" off the floor that probably adds about 6" of width to the 56" across, but it is only about 6" wide. This is all measured with the floor and not the storage compartment below the floor at the rear of the vehicle.