not sure either... maybe because the list starts ( when looked as 300ZX and not by code ) with Z31, then Z32 , then goes back to Z31 for the 2+2 ones ?

Not sure what you are referring to, they have Z31 and Z32 listed as the chassis code. You can look at them by chassis code.

I was looking at the Nizzan 300ZX page, and I noticed that it lumps both models of 300ZX together. As someone who knows 300ZX's, I have to disagree with this choice. Instead, the Z31 model (the early model) and Z32 model should be seperated by those designations, as they are practically different cars, and have different designations. Just some feedback.