I made these breathers for about 12 bucks each just wanted to share.....U guys probably already know about the Nissan fittings, part # 38323-C6010 (5$), some fuel line (5$) and a cheap fuel filter (2$)
You can weld a small piece (maybe 2 inches high) of round tube on top of the axle to prevent breaking the fitting off.....happy trails!