I happened to be looking at the back of the door panel that came off my 1966 13817 car and saw something interesting. The number on the door panel reads 13617781W45. This is a KC built car.

http://i344.photobucket.com/albums/p342/Zaran-122/DSC01561.jpg

http://i344.photobucket.com/albums/p342/Zaran-122/DSC01560.jpg