Each member of the appeals board shall serve for a term of four years and until his successor is appointed and qualifies. The term of office of each member of the board appointed pursuant to the 1967 amendment to this section shall also be for four years; provided, however, that of the two board members first appointed pursuant to such amendments, one shall be appointed for a term which shall expire July 1, 1970, and one for a term which shall expire July 1, 1971.

A vacancy shall be filled by the appointing power by appointment for the unexpired term. A vacancy filled by the Governor shall be subject to the approval of the Senate.