There are many out there,. You can do a search and buy one from multiple souces. I haven't found a BOSCH yet but you probably can. You can also search for a 2004 Mercedes SLK 320 and it will be the same type. Here's 3 options on this site. Keep searching for Bosch and / or better prices. Replacing it with any other them should help immediately if this is indeed the issue. You may want to go by Advance auto or a shop which will plug in and run a code check for free first, to see what iit says before buying anything. Chrysler Crossfire Crankshaft Position Sensor - Free Shipping - Replacement, Beck Arnley, Standard