I only know what I have seen and heard from Datsun forums and groups, the NL320 had about 1100 imported to the USA, and the U320 had about 1000 total made, less than 20 went to Australia, and the rest supposedly went to Asia, Central America must be part of the Asian allotment.
Never heard of a U320 anywhere but the 2 in Belgium that Severyn owns(both came from Australia), mine which also came from Australia via Ken in South Carolina, and the approximately 13 that we know of in Australia at this time, the one in Costa Rica was a surprise, and it being LHD was a real surprise.
It's hard to say what went to other countries, as they don't really join Datsun forums or groups, the very few that I know of started selling on ebay, and then joined a Datsun forum to sell there, a few started threads of their own Datsuns, but most just sell Datsun parts on ebay and the like.
This is in Saudi Arabia, they have a few of them.
Here is another special one there.
These are both of Severyns Datsun U320s that came from Australia.
Here he is with his wife.