Learn by doing I guess. The oil filler tube is made up of three seperate components. I replaced two of the three tubes. The one I did't replace is the L shaped plastic tube that connects the oil fill in the rear trunk. This tube ends just inside the engine compartment. I would highly recomment the Sears Craftsman tool to remove the spring clamps. Since I was also doing my RMS and had the tranny out, I did most of the work from underneath the car. It would be very different trying to do it from up above.
The picture below shows the middle tube on the trunk side with a flex (accordian) end.
The next picture is a continuation of the same tube that connects to the engine tube near the engine. The middle tube is the tube that is covered by a mesh sock. The mesh sock protects it from the engine heat. The sock has not been installed yet.
Be careful in removing this middle tube as it is very easy to break the ears of the tube that connects to the engine. This is what I did. The engine tube is quite fragile and has plastic ears that bolt to the engine block. Use a utility knify and carefully cut away the middle piece on the engine side.
I special ordered the engine piece and it should arrive from Sunset in 2-3 days. That piece will be harder to install as there is lots of obstacles near the intake manifold before you can get to the engine block and the connecting bolts, I will post pictures as I complete that installation.
Each plastic piece (there are 3 of them) are about $25 dollars each from Sunset. I purchasesd a $10.00 Sears Craftsman Tool to handle the clamps. What a tool. I don't know why I never purchased one earlier. Cheap I guess. If you are careful removing the middle tube from the engine tube, the middle tube is most likely the only tube you need to replace.
Good Luck!