Parts for driveaxles with differential, whether or not provided with other transmission components, and for nondriving axles, of closeddie forged steel, for tractors, motor vehicles for the transport of ten or more persons, motor cars and other motor vehicles principally designed for the transport of persons, motor vehicles for the transport of goods and special purpose motor vehicles, n.e.s. (excl. those for the industrial assembly of certain motor vehicles of subheading 8708.50.20)