I dont like to dissagree, but there is no such thread size as 9mm OD x 1.5 pitch.
I would be very surprised if Datsun made this size bolt for their product protection reasons - its soooooo far from the accepted engineering standards .
Maybe you should check again???????

sorry

Standard ISO choices are:

ISO metric fine threads - 8mm OD x 1mm pitch. 10mm OD x 1.25mm pitch. 12mm OD x 1.25mm pitch.

ISO metris coarse threads - 8mm OD x 1.25mm pitch. 10mm OD x 1.5mm pitch

These are the only international standard threads that are readily available. 9mm OD is not standard and not mentioned in any ISO charts and it would surprise me if Nissan used such a size in any of its manufacturing processes.