Hey everyone I need a little help. I just rencently bought a 1981 300sd and I guess the guy that I bought the car from lost the keys and he changed out the Iginition swith from another car that he had. How do I go about getting all the keys the same and what is the cheapest way to do that? Is there a site or some where I can go to get the cylinders myself and install them or what. Please let me know what my choices are.

Thanks
Eddie