I replaced my 2" fuel fills with locking ones from Get Real(
http://www.getrealperformance.com/). The fill body was slightly bigger than the original and I had to open the holes about 1/4". But, they are really nice pieces. They can make a matching water fill, too. However, I'm not sure on that size. I may match all of the fills this winter and get some of their colored bezels as well.