All of the provisions of Sections 21-25-5, 21-25-7, and 21-29-101 through 21-29-151, shall be applicable to any city operating under the council-manager plan as herein provided, and all rights of every policeman and fireman of any such city under the disability and relief fund for firemen and policemen shall be unimpaired, and there shall be no interruption or change in the operation or administration of the disability and relief fund for firemen and policemen, and other city employees.