This forum is devoted to '70-78 Zs only. In other words, 240z, 260z, 280z cars are all in this forum, but not the 79-83 280ZX, which this is directed to. Here is the link to that forum: S130 Series - 280ZX. If I'm not mistaken, you have to be a donating member in order to post legitimate for sale ads.
You might also want to pay attention to these rules, especially #12.
One last thing, being descriptive and adding pictures would be helpful if this was a legal post in the classifieds as well as your location and possibly even a starting price.