Just in case anybody's looking for a new block heater, I just bought one on Ebay that says it's a Genuine Ford part. It doesn't show the box that says Ford on it, but I bought it and I will see. It was from a seller who goes by "swagperformanceparts" and cost $69. The listing said that there was 8 available when I ordered mine so there should be 7 left now. I found it by typing "6.9l diesel engine heater" into the search bar. I had to order one soon since I discovered that the o-ring and the center bolt on mine are both leaking.