The provisions of Treasury Department Circular No. 300, 31 CFR part 306 (other than subpart O), as amended from time to time, shall apply insofar as appropriate to obligations of the U.S. Postal Service to the extent they are consistent with the Trust Indenture of the Postal Service and the agreement between the Postal Service and the Federal Reserve Bank of New York acting as Fiscal Agent of the United States on behalf of the Postal Service. Definitions and terms used in Treasury Department Circular 300 should be read as though modified to effectuate the application of the regulations to the U.S. Postal Service.