I have a 1976 300D. She's looking great sitting in the garage, but I can't get her started. By process of elimination we think it has to do with the glo plug...according to my Mercedes parts book the part number is 0035428317 and it is called " ready to start sender unit.. I have tried all the "normal" places to find it and have come up empty, anyone have any thoughts that might help? I'm really missing her