(1)    Filling of vacancies. Unless otherwise provided in the articles of incorporation or bylaws, any vacancy occurring on the board, including a vacancy created by an increase in the number of directors, may be filled until the next succeeding annual election by the affirmative vote of a majority of the directors then in office, although less than a quorum. In the event that the board ceases to exist, and there are no members having voting rights, the members without voting rights have the power to elect a new board.

   (2)   Appointed directors. Unless the articles of incorporation or bylaws provide otherwise, if a vacant office was held by an appointed director, only the person who appointed the director may fill the vacancy.

   (3)   Designated directors. If a vacant office was held by a designated director, the vacancy shall be filled as provided in the articles of incorporation or bylaws. In the absence of an applicable article of incorporation or bylaw provision, the vacancy may not be filled by the board.

   (4)   When vacancy filled. A vacancy that will occur at a specific later date, because of a resignation effective at a later date under s. 181.0807 (2) or otherwise, may be filled before the vacancy occurs but the new director may not take office until the vacancy occurs.