Use this fitting to adapt from the factory Quick-Disconnect to -6AN. Ditch the sketchy plastic retainer, this fitting includes a billet lock retainer that threads into the back of the fitting.
320.0086 : Adapter for stock fuel pump hat to 6AN (350z, 370z, G37, and G35 Coupe).
320.0087 : Adapter for engine bay end of stock fuel delivery pipe (all Z and G), also G35 Sedan Fuel Pump Hat.