Notwithstanding the provisions of § 17-12-6 and § 17-12-7, the town committees of the town of Johnston shall consist of twenty-five (25) members; five (5) each to be elected from the qualified electors of the five (5) council districts of the town comprising the respective candidates from each district receiving the most votes in each district. The five (5) members elected from each district shall constitute a council district committee, which shall organize and endorse the council and school committee candidates from each district. The town committee shall elect a chairperson and provide the endorsement for the party candidate for mayor.