Hello...this is my very first post on this forum. I've been reading and reading since before joining and buying my 2nd z car but my first S30 a nicely kept, 1971 Blue 240z Series 1 (build date 10/70)...my other car is a Z34. My apologies for resurrecting this old thread, but it seems to be the most complete and provides a lot of interesting information. My reason for posting is because I came across these "D" hubcaps on eBay. The seller stated that they were Series 1...but since I want to keep my girl as stock as possible...I want to make sure. After doing a good deal of research it seems that they are not...you'll notice from the photo that the value stem opening is smack between the spokes. They also have more teeth as described for the later D hubcaps. The other thing that I'm curious about is that two of these have the hole above the D and the other two below the D. Can anyone tell me why the holes are where they are? Also, is there any chance that these would have come on a car with a build date of 10/70? What are these? Thanks in advance! Confused in California.