Came across this picture the other day and I'm thinking about buying one, popping in a nice motor etc.

anyways trying to figure out what the differences were between the various ones. USDM are all 4 headlights, datsuns, AUDM seem to be 2 headlights, datsuns, and then the JDM ones are both (like this and this) and sold as nissans? really confused right now not to mention the different nomenclature, nissan sunny's, datsun utes, datsun 620, b120 etc.

anyone shed some light on this? just want to make sure i don't go buying the wrong thing. i want to see how close i can get to the original one, but without the ghetto