I agree with Lee. The tank is not correct for your tractor. Because of that customization, you now have a hood with an extra hole to access the non-standard fuel filler neck.
The tractor is an early 1958 by serial number. It's also distinguishable as a '58 model because the radiator neck/cap are covered by an inspection cover. The 1959 models had the radiator neck and cap extend up through the hood.