I saw a fuel leak on my 1975 W115 240D this morning. It was coming out of the vent lines that route into the trunk. The connections between the tank and the lines are just a stepped down small bent hose. Where do I get these little hoses?

 

Found out that the hose wasn't different sizes after all. Traveled to Sacramento and found some 7mm hose, cut it to fit and no worries.