Try calling around to local tire shops. They might not have one but could know of a shop that does. Where the old ones working if so get them back they are easily cloned. Any tire shop can clone a working one.
While there are a few Chrysler and Mercedes shops that are familiar with the crossfire most are not. A big problem with dealers is you never talk to a mechanic just a service writer. Another issue is the mechanics that had the factory training on Xfires 18 years ago were the better mechanics. Which generally means experienced probably retired now.