jeepgrady,
When I looked at the '300 Limited' and '300C' models which came equipped with the 'genuine' California Walnut wood trim upgrade option, the only 'genuine' wood parts were the trans shifter knob, the door grab handles, and the upper portion of the steering wheel...that's all. Both the 05/04 and the 08/04 Chrysler 300 series catalogs note this as well. This fact was also corroborated by two different salesmen at two different Chrysler dealerships which I had visited. Their reasoning for this was the fact that the trans shifter knob, the door grab handles, and the steering wheel would actually age more over time through normal use and that the plastic overlay would eventually wear-off over time. This sure made sense to me, as I noticed this same problem with the Cadillacs which I've owned over the years, as everything which looked like wood was in fact a wood grain plastic overlay and would actually wear-off over time.
The balance of the wood grain trim in the 'genuine' California Walnut wood trim optioned vehicles I examined, was actually a synthetic (a plastic overlay-type) material. For me, it's actually pretty easy to tell the difference between the two trims, as the plastic woodgrain overlay simply looks like shiny plastic and the 'genuine' wood portions look like real wood and not quite as shiny...at least to me they appear that way. The synthetic woodgrain trim was a pretty close match, but wasn't an exact match to the 'genuine' wood portions.
The thing which really strikes me interesting about this whole ordeal is the fact that DM chose the name California Walnut...odd, as we're more well-known for our Sequoias and Redwoods.