Originally Posted by
GraphiteGhost

Here are the ones that were in my 08. They ARE made by Schrader (blow up the pictures, the first 4 are of 1 sensor multiple angles.

Those are same as mine from '05 Roadster (man. date: 07/04). As I posted previously, when one failed, replaced all with Napa part #92-1016C. Came each in a sealed bag in box (imported and I insisted they all be sealed, one was not). Not inexpensive but a dealer tech programmed our car to them "under the table & off the clock" for few $.
So the "frequency" was correct and all is well still after a few years. My .02.