I noticed a difference between the '04 and '05 interiors when I was test driving the cars. One of the reasons I bought the '05, at a higher price, was the lack of the high gloss on the silver trim pieces. I liked the almost stainless finish on the '05 much better.

So, long story short, you have a trim piece for an '04, which had the glossy interior pieces. Look through the photo gallery and pull some photos for comparison. I have a two interior shots, in the gallery, that may help convince the dealer.