There shall be no required qualifications for open members. At the annual election in 2004 and each third year thereafter, one open member shall be elected to a three-year term. At the annual election in 2005 and each third year thereafter, one open member shall be elected to a three-year term. At the annual election in 2006 and each third year thereafter, the three restricted members shall be elected to a three-year term. Such elections shall be conducted simultaneously but as elections for three separate offices, in which only persons qualified for a respective office may be a candidate for such office;
§ 86.930, RSMo