7 heavy duty diesel engine parts, not for land vehicles, namely pistons, piston rods, and retainers, rings, ring sets, heads, cylinder liners, liner seals, pistons, piston pins and retainers, bearings, bushings, thrust washers, springs, valves, valve guides, fuel injectors, fuel pumps, water pumps, oil pumps, and camshafts, all for use in construction, marine, oil field, agriculture and generator applications; and heavy duty diesel engine parts, for trucks, namely heads, cylinder liners, liner seals, bearings, bushings, thrust washers, springs, valves, valve guides and camshafts