I went through this process a year ago, when I got the 280 SL. I replaced all the hoses, and there are indeed formed ones, and "by the meter" ones. I am traveling today and tomorrow, so am not able to check the part numbers. I do know that the hose by the injection pump from the heater core, is an odd one, and it also depends on the year of the car, as the were some changes with the warm running device pod, which I think changed the routing of the hose. . I am a little fuzzy on this, and would have to look at the car to give you a better answer. I am sure someone else will chime in before then.