New 4 Buttons Mercedes-Benz Smart Key Remote Case Shell for E C R CL GL SL CLK SLK No Chips Inside
This worked perfectly for my Mercedes-Benz key.  I can't tell the difference between this one and the original.  It was quite easy to move the contents from my old cracked key case to this new one.  Best of all, I saved nearly $300 that the dealer wanted for a new key!