They are a popular, commonly used, made in Mexico(I think) tube header sold by many suppliers. Search for the best price. Also, if you can swing it, have them ceramic coated. They will last longer and look better. Check for flatness on the header plate though. Sometimes, but not always, they need a little masssaging.
Last edited by Drew, II # 4211; 06/06/11 12:48 PM.