What fuel tanks are you guys using?

It looks like the one that tower recommends will not fit without too much cutting on F2. I don't have the fuse in front of me but it looks like the opening is 4 5\8 x 2 7\8 and the tank is 4 3\4 x 2 1\2

It looks like the Sullivan 10 oz slant tank will fit at 4 3\8 x 2 1\2

Anyone have any luck with any of the others?