Customs duty parity: imported goods' customs duty to match ad valorem excise by including customs charges and additions. Amendment to section 2A requires customs duty on an imported article to match excise duty charged on a like article when excise is levied at a percentage of value; valuation for this purpose is the aggregate of the imported article's determined or tariff value, other customs duties chargeable under the general provision, and any statutory sums imposed as additions in the manner of customs duty.