maybe the rarest of the rare when it comes to horn lights. a couple of years ago I toyed with the idea of setting up a service to convert standard Delta head lights to this configuration. (I have several small diameter horns on hand) the bottom line is that it takes so many units to compensate for tooling up. a standard shell can be "punched" w/ water laser &, I was told, the fins are not hard to make. it's the jig that holds the shell in position that get's dicey. maybe someone needs to get John interested in Wingbars ?
the last "...few parts..." are what make all the difference.