HDDP, I completely agree. I went into Tire Rack and Plugged in the MB SLK 320, and all the 18's came up. Looks like a perfect fit, but I will use your earlier advice on tire size, etc. I believe that will be the way I go when it comes time to replace the tires. By the way, thanks for all of your advice and information on the site. It is great having someone willing to share so much information, and experience.