Where do you live? Maybe near Sao Paolo?
In what condition is the engine and gearbox ? Propably there could be some problems with parts, it's not popular tractor overseas.
http://instrukcja.pl/i/ursus_c325_instr ... gi_czesc_2
There you can find original manual for Ursus c-325 in polish version.
What you mean about "fix the radiator" ? The tractor overheat, cooling system doesn't work fine or you're not sure that's original radiator ?