I can certainly recomend Vinwire. I have had 3 harnesses made by them, 2 Ford and 1 Chev. All excellent quality and everything in the right place/length. Full instructions and diagrams included. The wire colours/traces are the same as original (well, as described in MB-F1) and are all numbered for easy installation. The numbers can be removed after installation or left in place. Very easy to talk to, and will customise for modifications like turn signals, trailer connections, radios, cigarette lighters.....................
Should also mention another source for WW2 vehicle wiring needs,
http://www.mvspares.com/