I have seen these in which the actual light fixture was a separate white plastic housing piece and the wires are asbestos braided red and yellow. I have also seen them where the actual light fixture was incorporated right into the clear lens cover being part of the lens itself. The wires were also red and yellow but not asbestos braided? Both have the side to side lines in the lens with a slight curve. Can anybody tell me any history on these and when they were changed? If anybody has one that they want to sell, I could use one for my project. Thanks......