My base 2004 Z states it was built on 04/05, so does that mean I am a 2004 or were changes made to make me a 2004.5. I'm somewhat confused because I thought I was a 2004.5 because I have a driver's and passenger's side knee rest, but the date indicates I was built in the pre-2004 period. Any thoughts, and what other clues should I look for?