The fiat can be found on Siege of Tobruk
The Fiat 508 C.M. was shown after the release of 2.4 and it isn't in the files either, but I think you mention the Fiat 626 truck which are present in Sidi Rezegh and Vossenack but I ain't sure if it is in other maps too.
The Carro Armato M13/40 can be found on the fan-made Bardia map.
It can also be found on Gazala, Siege of tobruk and Sidi Rezegh.