N.J. Stat. § 19:13-21
If the nomination vacated is that of a candidate for elector of the President and Vice-President of the United States, the vacancy shall be filled by the committee to whom power shall have been delegated to fill vacancies if such there be, otherwise by the State committee of the political party which nominated the elector whose nomination is vacated. The chairman and secretary of the vacancy committee or State committee shall file with the Secretary of State on or before the 54th day prior to the general election a certificate of nomination for filling the vacancy. This certificate shall be made and filed in the same manner and form as heretofore provided for filling vacancies among candidates nominated at the primary and there shall be annexed thereto the oath of allegiance prescribed in section 41:1-1 of the Revised Statutes duly taken and subscribed by the person so nominated before an officer authorized to take oaths in this State.
N.J.S. § 19:13-21