Any chance that there could have been two different styles of custom wheels.
I know that the basic wheel has a round center but it only has a round center.
I have a horn button that I believe is for a custom wheel. While it does have a round center it also has the half circle outer ring as well.
While in KC for the show I saw one custom cab that had a smaller wheel with this same horn set up. Only problem is that I did not ask questions then. If it wasn't a true custom cab wheel it sure fit like it could be factory.
So here I am now.