Ah ha back to the problem I had.
I spoke with my engineer and I explained the situation and that Aus delivered cars do not have the weight stated
in the owners manuals , I went on to explain I can show him a (S30) weight in a Nissan owners manual for over 1500kg but it was from a american s30,
he was was more then happy with that.
This is quite advantageous as the 77 280Z 2+2 California spec car must have led floors as it comes in at like 1550 kg or something silly.