to the total number of member directorships which, on December 31, 1960, were filled by officers or directors of members whose principal places of business were located in that State, the Director shall add to the board of directors of the Bank of the district in which that State is located such number of member directorships, and shall so designate the directorship or directorships thus added, that the number of member directorships designated as representing the members located in that State will equal said total number. Any member directorship so added shall exist only until the expiration of its first term. (d) Board size, composition, and elections for combined Banks Notwithstanding any other provision of this section, the following requirements shall apply to the size and composition of, and the election of directors to, the board of any Bank created as result of the combination of two or more Banks under section 26: (1) Board size The management of a combined Bank shall be vested in a board of 15 directors, or such lesser number as the Director determines appropriate, consistent with the safe and sound operation of the combined Bank. (2) Board makeup The Director shall establish the respective number of member directorships and independent directorships for the board of the combined Bank such that— (A) member directors shall comprise at least the majority of the members of the board of directors