I checked over on the Benz. forum and the AMG guys are looking for spares also.The SLK AMG has bigger wheels( 17") and they couldn't fit a spare that size in the trunk.The base model SLK's come with a compact spare that you have to inflate.With the crossfire having two different size wheels it would be hard to get a spare in 18" or 19" diameter.Just comes with the territory owning a small sports coupe with huge wheels.