I don't know if this is the dumbest question ever, but I certainly feel like it for asking. I replaced the air filter on my '83 300DT. I didn't pay attention to how it came off, and now I can seem to get it back on! The threaded metal piece that comes in from the top of the housing certainly seems like it should mate to the plastic piece inside the housing, but they are the same circumference. Does this point aimlessly into the housing or should it be connected to something???? I briefly searched the forums but I have to drive to work shortly and I'm not sure if I will find the answer in time. Any help is greatly appreciated!!!