When I was doing this I could not find an adapter to adapt 1967 column wiring to 1966 body harness wiring. Not a problem. I made my own using 1/4″ female spade connectors.
The 1967 column also include hazard light switch which was not original on the 1966. The brown wire for the hazards has been extended and will connect to a simple flasher circuit I will add later.