Date registered: Feb 2008
Vehicle: 2004 W220 (S430) ; 2001 R129 (SL500) Sport
Location: Alabama Gulf Coast--formerly Charlottesville, VA
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Take the registration or some other proof of ownership and positive identification to the dealer. They will be able to order a replacement key. The key is made to the VIN of the vehicle and is synched to its electronics. There is no other place I know to get a replacement electronic (Smart) key except the dealer. Be prepared to part with about 300 USD.
"Don't pick a fight with an old man. If he is too old to fight, he'll just kill you."--John Steinbeck