Okay, this is a Tiico question (Karl M may have the answer as he did
this to a Tiico...)

I was looking through the EKTA for the part number for the oil filler
tube that comes out the license plate opening...on the inline 4 (I
presume that the Diesel filler tube is the same.)

The problem I'm having is there seem to be 3 or 4 different part
numbers for the tube.

I believe the one I saw (that Karl had installed) was a single piece
unit. Well, single in that the part that hooks into the oil pan is the
same that connects to the extension tube. One of the oil filler tubes
and a separate part that did the actual curve upward.