Where in pursuance of any agreement, convention or other instrument it is necessary to accord to any diplomatic mission and its members, the sending State of which is not a party to the Vienna Convention on Diplomatic Relations, 1961, or to any other special mission and its members, privileges and immunities in India similar to those contained in the provisions set out in the Schedule, the Central Government may, by notification in the Official Gazette, declare that the provisions set out in the Schedule shall, subject to such modifications, if any, as it may consider necessary or expedient for giving effect to the said agreement, convention or other instrument, apply mutatis mutandis to the diplomatic mission and its members, or to the other special mission and its members, as the case may be, and thereupon the said provisions shall apply accordingly, and notwithstanding anything to the contrary contained in any other law, shall in such application have the force of law in India.