Okla. Stat. tit. 20, § 20-3: Justices elected - When

At the regular biennial election in 1918, a justice shall be

elected for each of said four additional districts, who shall be

nominated by the electors of the district in which he resides, at

the primary election, next preceding such biennial election. The

justice for districts six and nine shall be elected for a term of

six (6) years; the justice for district number seven, for a term of

four (4) years, and the justice for district number eight, for a

term of two (2) years, and thereafter, three of the Justices of the

Supreme Court shall be elected at each general biennial election to

serve for a term of six (6) years each, from the second Monday in

January, succeeding his election. The successors to the existing

five justices shall be elected at the time authorized by existing

laws, it not being the purpose of this act to disturb the terms or

districts of such justices.