Last year I made my own replica headlight ground cables. They weren't too bad but luckily some real ones came up on the famous auction site.
The packages came from America - they look absolutely brand new. They're dated 1952 but made to the same spec as the original factory production ones. Inside the packages the cables looked like this:
Really top quality condition, just a little stiff due to the cosmoline preservative having hardened off.
Some closer views of the cables:
After gently straightening them out, I removed the cosmoline from the connectors by wiping them with white spirit and then fitted them to the headlight brackets. When I made my own replicas I fitted them under the headlight bracket, this is wrong, they should be fitted on top. I picked this up when I was lucky enough to get a look at a really original MB a little while back.
Final result is very pleasing 
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