yeah i´ve heard about intolerance between croatians and slovenians ..is it truth??
oh if it were possible to write different engine, wheels, etc. to car licence in czech republic

we can´t write anything (apart from parts with homologation) and with wheels is still problem because you have to buy a new ones with "data sheet"

even if you show copy of car licence from different car (same type) with wheels that you want to write into licence for officer, its impossible