I had the same problem and could not find enough information, so I asked and was replied to from the Restorers Q and A section, they did find the information in the Bratton's catalog. My problem was that the brass end terminals on the wires were not seating into the fiber socket that is there to hold them. What was needed with the repo plugs was to drill them, but only just a little, this will allow the little brass ends to set down into the plugs correctly. when this was done they fit correctly and I have had no problem since.