While maybe you can find ngk plugs for the car, I agree it is not worth the trouble. NGK recently changed their part numbers by the way, making all of this only more confusig. Plus the parts feed to the auto parts store and their own website has errors. Buy the Bosch plugs SPECIFIED IN YOUR OWNERS-MANUAL. If you do not have it go to the Busch USA website and look it up. Do not just use whatever comes from the dealer and their parts feed, the bosch website is a more reliable source believe it or not based on my experience. MB has changed some plugs for the worse. For example, if your original plug is not large electrode (no 0 on the end of the part number), do not change to large electrode as MB might suggest. I get the feeling you are trying to solve some other running problem such as rough idle. If so maybe you could post on that.