I need to get a 99+ heater return tube for my headswap. The gentlemen at my local Ford dealer have "No idea what I'm talking about" and have "never heard of such a thing". I have the basic parts listing but they don't show a part number for the return tube. Can someone show me a picture of a heater return tube so I can show this guy what I'm talking about. Also, why doesn't it have a part number and if it does can you fill me in? Thanks.