I have a Kong distributor that is missing its cap. The caps cost as much as the distributors do if you can even find a cap. They only made those distributors that used that cap for one year. I had a stroke, so I don't remember if they were Cad's or Lincolns (1932?) but because it was a one-year only V8 they only sold about 400 cars that year. Most of the Kong distributors I see for sale have broken caps so that means they are probably made from that fragile Bakelite. I was friends with Kong and I asked him why in the hell did you use a cap from a car they only made 400 of, he laughed and said, "I don't know, it just happened to fit. It wasn't' a problem to get those caps in the late 1940s." Besides the Ford V8 there much of a selection of V8 caps back then.
Somebody could probably reproduce the caps, but I doubt there would be an enough demand for anybody to bother. They were the very best distributers, if you could afford one. They were big bucks and only the most serious dry lakes and drag racers used them. I copied Kongs photos that he had done for either advertising or a magazine article on that distributer when he first developed it, but as far as I know the photos were never used. Really nice photos. He was a really neat guy, no secrets, an open book about anything you were interested in. That was the reason I wanted a Kong distributor because we had become friends. I'll probably end up having to buy a complete one just to get the cap and then I'll always be afraid of breaking it. I forgot to ask him what he used for the points.