Z32 rear hub question

[arts_zenki]

Well I wanted to know how to tell the difference between TT hubs and na hubs? I've searched around and noticed most people saying the difference is that tt hubs have a tab. But than I found a couple of people saying that some na hubs have the tab as well, and that it actually varies from year to year. Now I'm confused can some one shed some light on this

The reason I'm asking is because some on is selling me a set of rear hubs and doesn't know if they came off of a TT or NA. Here's the picture he sent me

Thanx