There are two patterns of "tomb stone" front castings used on Fordson Majors.
The hole patterns are different, and slab weights will not interchange between type 1 & 2.
Type 1 - 1952-58 Diesel Major & 1958-60 Power Major [orange wheels]
Type 2 - 1960-62 Super Major [orange wheels] & 1963-65 Super Major with grey wheels.
Note the 1963-65 grey wheeled Supers had grey hoods and were called Super Major 5000 in the USA.