ThermoQuad 3/8 fuel inlet

Anyone using a 3/8 fuel inlet in stead of the 5/16 one? If so where did you get the parts from ex. Napa, Summit,tubes n hoses. I see I can get stuff on the internet but would really like to not have to pay shipping on a 4 dollar part. The carb side of the fitting is a 5/8 -20 with Banjo seal.