I agree x3 with Duffil and OOPS. I tried those breathers, they dont work, that make more leaks than they are worth. Plus the front breather was so big it hit the frame.
I got fuel line and vw fuel filters to fix mine, in the rear I ran it all up inside the taillight as high as I could get it, then in front up to the engine compartment, again as high as I could get it.
http://board.marlincrawler.com/index.php?topic=58674.0