A method for attaching a cosmetic body panel to a composite cargo box without inclusion of a conventional integral lip. In evaluating the mixing of the gases which are exhausted from the adjacent combustion cylinders, there are considered the lengths and shapes of the exhaust manifolds of the respective combustion cylinders. The thin-film solar cell at least includes an anode layer, a cathode layer, and a photoelectric conversion layer between the anode layer and cathode layer, wherein a portion of the anode layer or a portion of the cathode layer is exposed from the thin-film solar cell.