I thought it is maybe helpful to summarise my experience so far with LHD Zs imported for anyone thinking of doing this in the future:
The headlights are a must to change according to the VASS engineer (there was no room for movement there, even when I thought I came up with the idea of the century to turn the light 180 degrees to fix the Left, Right issue) he did not find that funny at all… On this topic I did call Toyota and they told me that the headlights (90981-01H22) are 110$ each! Do you think I can find a better deal on these or something close somewhere? The Z I have is fitted with a Halogen light kit but I have to change the beam only to a RHD one.
Now the good news on the tail lights is that it is (Optional) to change them at least in VIC. The only thing to know (what I was told) is that if you are involved in an accident and the guy hitting you from the back says I did not see that the indicator was ON then it's your responsibility.
As for the seatbelt issue I am having, the thing is I would really like to keep the originals, they look great and they have the Z emblems on them. Now since this car is manufactured in 1970 I don’t have to have a retractable one so a normal hanging belt will do but it has to be in 2-parts not 3-parts as I have it. And as mentioned by (twoforty z) earlier it has to be mounted on the factory mounting points. So I am looking around if I can only replace the belt side and keep the buckles I have on the car. I called Seatbeltking and sent some pictures will see what they say.