Hello folks, hope you are all well. I have a 1992 300d 6cyl deisel engine 603912 type and non turbo, I think thats about right. Anyway I am now getting the clicking sound from the rocker cover and will soon be investigating the state of things in there. My question is does anyone know where I might get new hyd lifters if needed without going to a dealer and also some tech info on them. All I have is the Haynes. Many thanks for you time. DPM