Hi, just saw this. I just bought the last NOS pair of tail lights for my U521 at the local Datsun dealer and I paid the equivalent of $678 for the pair. They are unique to this body style. Bumpers are NLA, grille parts NLA, emblems are worth their weight in gold. Kind of disheartening.
On the bright side, front bearings, both inner, outer and seals, are easy to find. I just did mine yesterday.