(a) There shall be municipal councils for Rota, Tinian and Aguiguan, Saipan and the islands north of Saipan, to be composed of three members, elected at-large in the island or islands to be served and on a non-partisan basis. Candidates for municipal council shall be at least twenty-one years of age, a resident of the municipality for at least three and shall serve for a term of two years. Each council shall adopt its own Rules of Procedures.
(b) In the case of a vacancy in a municipal council, the mayor of the island or islands served by the council shall appoint the unsuccessful candidate for the office in the last election for the council who received the next highest number of votes. Otherwise, the mayor shall appoint a person from the island or islands served with the advise and consent of the legislative delegation of the senatorial district for that island or islands.