I updated the original post with the part number.
It seems to be the rubber tubing part of the Filler Neck.
As we all know, the rubber parts tend to deteriorate over time.
There were some metal parts for the 2003-2004, thus the question.
Plus, some sites list the 2005 part for the 2003-2006.
It's very confusing as to what fits and doesn't fit.
That's why I'm asking the question.