The description of the item 73201003 of New-Zealand HScode: Leaf-springs and leaves therefor, of iron or steel (excl. clock and watch springs and shock absorbers and torque rod or torsion bar springs of Section 17) : For use in the assembly of motor vehicles as may be determined by the Minister in accordance with section 14 of this Act : For the vehicles of headings 87.02 and 87.05, and road tractors of heading 87.01 and vehicles of heading 87.04 of a g.v.w. exceeding 3,500 kg but not exceeding 10,500 kg