Sorry, didn't know 4.5 wheels were called 114mm in Australia. In the US we talk metric if that's how it was made, or inches if it was made to the old measurements. Many US cars have metric bolt-patterns.

I doubt if your're going to find any Nissan axles to fit the 4x100 ... all the rwd Nissan cars were 4x4.5.

Maybe Mazda axles might work ... the Mazda 808 used the same axle housing as the 1200, but I'm pretty sure it had a different wheel bolt-pattern. I had a 1976 Mazda 808 which was the piston-engine version of the RX3 or RX4.