In my research I haven't been able to find anything. Though I will keep looking, I have decided to make one. Only a few minutes ago I ordered 2 - 4" pieces of 10" PVC pipe from FlexPVC.com. The ID of the pipe should fit over the dome shade, thought it might have to take a turn on the lathe to fit. The next step is to either make an end to the pipe and glue it on or get a 10" cap. The cheapest 10" caps I have found are about $66 USD (again at FlexPVC.com). I'll let you know how this all works out, but if you do find something pre-made please post it.