My VIN number is 2G1WN52M7S9296953, so I guess I'll get that MS98004T, assuming the M in my VIN is the "M" you're talking about. Sorry, I don't know a whole lot about this car when it comes to these kind of details.
I probably will skip out on the O ring, but thanks for the suggestion. To be honest, I am selling this car in a few months. My gas mileage has really gone down so I figured it is time to finally change these. I was hoping it would be okay long enough to just sell it as-is.