The problem with TRX rims is they are designed for a strut with negative scrub offset,whilst they may physically fit on older datsuns like 1200's 1600's and stanzas or their struts they will not have the correct steering geometry and handling will not be as good as with wheels with the correct offset for the older strut design.
Rims for older toyota's and mitsubishi's as well as older triumph cars and earlier datsuns offer compatable offset's and will work much better and offer a decent range when searching,just remember nothing front wheel drive will work correctly as they also use negative scrub offset designs.
If you are using bluebird struts it can be an option with some mods.
Rear studs for a Skyline or Bluebird will be longer as they used a top hat style disk that sat over the studs hence the studs are slightly longer,Subaru's also offer studs you can use due to their long standing tie up with Nissan