Renewal of contracts for highway post office service

§ 6353. Renewal of contracts for highway post office service (a) The Postmaster General, by mutual agreement with the holder of a contract for highway post office service and without submitting the service for bids, may renew the contract for successive periods of not more than six years at the rates of compensation prevailing at the end of the preceding contract term. (b) The Postmaster General may enter into a contract with the subcontractor then performing the service, in the same manner and upon the same terms as prescribed in subsection (a) of this section if— (1) the holder of the contract has sublet his contract in accordance with its terms and does not indicate in writing to the Postmaster General at least ninety days before the end of the contract term that he desires to renew the contract, and (2) the subcontractor has performed the service required under the contract to the satisfaction of the Postmaster General for a period of at least six months.