I'm using the 2013 Mustang style radiator overflow tank (http://www.summitracing.com/parts/mor-63783) and prefer not to use the origional radiator cap b/c it won't match the rest of my accessories. I purchased something I "thought" was a billet cap, but found out it was just a cover that is supposed to go over the existing origional cap (http://www.americanmuscle.com/radiat...rome-2011.html) Unfortunately, it sticks up too high (into my hood) and frankly I don't like how it looks. Does anybody out there have a cleaner solution or do you know of a billet radiator cap that will work on a 2013 mustang overflow tank?