Damn you guys are good. I agree on the just replace it idea. I was thrown as I saw a Denso sticker (yellow and white) and and the cap had a different color sticker but it is olive so I suspect you are right and it is original.
Dumb question, is there an easy way to tell if my radiator is stock? I've just picked up a 3rd gen in good condition but high miles, 277k. I'm the third owner, and the second owner who had it for 2 years and he had not replaced it.