I need a new fuel shut-off valve for my Ford 600. I have done the re-building trick. The first time, it worked a few years, but the second time, it leaks. I notice that the dealer cost is $107.00. The usual suppliers sell it for $25.00 to $35.00. I do not mind paying for the real deal if they actually exist. They are a hassle to change as you know. From what I have read on forums, most of them leak. What is my best option?