According to the 1957 FOMOCO Parts and Accessories book, (except the SW) The Fairlane with the 272, 292, and 312 all using the Ford-o-matic all use the same accelerator retracting spring and is Part number B7A 9737-H . Your Mac's part number B6A-9737F spring in 1957 fits the Passenger car Standard and OD transmission models.