Where is the best place to find a dummy spare for my crossfire to have when taking a road trip ? I hear mercedes SLK have one that I could use. If so what year and model. Also I would love to have a full real replacement time in the garage, one 19 inch, and one 18 inch just in case on hand. Would junk yards, although i hope not to see one there have this. What would be a fair market value for these items ?