Michigan Compiled Laws, Chapter 450. Corporations § 450.1515a

Sec. 515a. (1) Unless otherwise limited by the articles of incorporation, if a vacancy, including a vacancy resulting from an increase in the number of directors, occurs in a board, the vacancy may be filled as follows:

(2) Unless otherwise provided in the articles, if the holders of any class or classes of stock or series are entitled to elect 1 or more directors to the exclusion of other shareholders, vacancies of that class or classes or series may be filled only by 1 of the following:

(3) Unless otherwise limited by the articles or bylaws, in the case of a corporation the directors of which are divided into classes, any director chosen to fill a vacancy shall hold office until the next election of the class for which the director shall have been chosen, and until his or her successor is elected and qualified.

(4) If because of death, resignation, or other cause, a corporation has no directors in office, an officer, a shareholder, a personal representative, administrator, trustee, or guardian of a shareholder, or other fiduciary entrusted with like responsibility for the person or estate of a shareholder, may call a special meeting of shareholders in accordance with the articles or the bylaws.

(5) A vacancy that will occur at a specific date, by reason of a resignation effective at a later date under section 505  1 or otherwise, may be filled before the vacancy occurs but the newly elected or appointed director may not take office until the vacancy occurs.