I stopped at this substation in California to photograph some JD suspensions that I saw from the road. After looking around I noticed that these posts were made from the same porcelain disks that the suspensions use. They appear to have plates made into them instead of the usual "spider" connectors. I wish I could have gotten a closer look. Sorry about picture quality, I used my camcorder for a close up and used my digital camera to transfer to here. If anyone has one of these I sure would like to add it to my JDs!