Huw,
I have a 73 240Z which only has a choke cable, whereas i think you have throttle as well.
I am sure Nissan sells them for around $20 each (I could be wrong).
I am not sure if i understand you correctly, but dont screw the levers up into the console, otherwise it will break eventually. I made up a bracket using old tinplate that i screwed down onto the transmission tunnel near the ashtray area, then i screwed the choke lever to this bracket. It all lines up perfect with the slot in the console, but this way the pressure and force is on the bracket, not the expensive plastic console.
So yeah, just make the bracket yourself.