im tyring to do my dual fuel lines but the plug in the front has a bigger thread size than the banjo bolt on the side where the stock fuel feed is. does anyone know or remember what size the fitting was or where you got it.

 

When I did mine I took the plug with me, found a metric nut that fit the thread size and bought a fitting with the same thread size as the plug.

Any store that sells fuel fittings will have what you need.