Gentlemen, Thanks for the replies and info., always appreciated on this forum.
I have 2 CI6 roadsters, 1 very original and 1 I am restoring (very helpful to have both!). As Gunsmoke stated, the standard horn was a Klaxon
mounted on top of the engine. My original has that horn. (see pic). The other car came to me with restoration started, only with the trumpets, which are probably not correct.
However, dual Delco trumpets I believe were available as optional equipment (see pic.). For now, I mounted the trumpets and not even sure if I like them or prefer the clean look without.
Easy enough to remove, I'll decide before Hershey this year. Thanks again for any feedback.