I am of the impression that most of the later M's came with NGK Platinums. My 04 ( build date 3/03) came with NGK's. AAP keeps them in stock around here. Either will work, though.
04 300M, Lux Group, Rims, & Roof
Give a man a fish, and he will eat for a day. Teach a man to fish, and he will sit in a boat all day drinking beer!