As I clean up and service this (1977 I believe) B6000, I am noticing various things that need to be addressed. The fuel return lines are pretty ancient and i would like to replace those lines between the injectors as well as the line to tank. Have not probed line to see what is or if there are barbed connections - I am used to those hard plastic lines with banjo fittings on the German stuff. What are members using to replace these lines? Thank you!