Just went through this a couple months back for the 560. Utilized Walters in Riverside, all I needed was my registration and $28 per key. They ordered them from the factory, and had them on hand in 3 days. Perfectly cut and work great (even arm/disarm the alarm).
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72
'02 CLK320 Cabriolet - wifey's mid-life crisis
2012 VW Jetta Sportwagon TDI...at least its a diesel
Non illegitemae carborundum.