Customs ad valorem rate amendment raises exemption rate for computer peripheral parts by substituting prior notification terms. The Central Government, under the Customs Act, 1962, amends Notification No. 349/86-Cus by substituting the words and figures '20 per cent ad valorem' with '30 per cent ad valorem', thereby altering the ad valorem rate applicable to piece parts for computer peripherals within the existing exemption notification.