For my 'kit' I took a 14x25mm, 1. 5 pitch metric bolt and replaced the stock banjo bolt. I used two white nylon oil drain plug washers between the bolt head and top of banjo fitting. Torqued to 22ft/lbs. Took a WOT run up and down the highway, no leaks yet. The valve is located on the top of the rail, behing the fuel pressure sending unit.