Like Gilly said, go to the dealer with your registration/proof of ownership and just order a new ignition tumbler for your car by VIN. Should come with a new key that will also work your doors. Once installed, it'll be as it was the day it left the factory.
'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.