I have a set on eBay now. My dad bought a 1971 240Z back January of 1971 and sold it shortly after I was born in 1973 to get a four door Audi Fox. He really wishes he had kept it now! In any case my mom was cleaning out the garage yesterday and I rescued these from the back of the van before it went on a run to the dump! (She saw the "D" and thought they were off of an old Dodge van we used to have ) I think we still have some of the original promotional materials, maybe an owners manual or window sticker... I'm not really sure.
In any case I put the hubcaps up on the classifieds here, but I didn't find the forum until after I already put them up on eBay, so the ad is really a link to the auction.
It's kind of interesting, because I have two 1990 Infiniti Q45s that I really love, but they can be bought for next to nothing now. I wonder if they'll be collector's items someday too... Kind of like the Z they were the first of their type, and are even the flagship of a new car "brand" - the only difference is that they didn't sell that well... Oh well, I guess I'll find out in another 15 years.
Heath