Here is the original signal hub.
https://www.flickr.com/photos/advance-design_parts_co/8129302195/in/album-72157631868452754/
Wiring cover from column.
https://www.flickr.com/photos/advance-design_parts_co/8129365096/in/album-72157631868452754/
There are several pictures of a NOS set-up here. There are directions as well, I believe all the parts were the same from 54-59?
https://www.flickr.com/photos/advance-design_parts_co/22702548351/in/album-72157631868452754/