[FirstOwner69]

Dave makes a good point.

I'm not sure when dual horns became available nor, if when they became available, they were an option or part of the higher trim packages. For example, my 69 CST only came with a low note horn mounted on the core support.There wasn't even a mounting provision for a high note horn. So, it's possible that your truck is original with only a low note horn on the core support. Perhaps someone can clarify that.

Below is a picture (sorry, the horns seem to blend in a bit... added 2nd pic) with the later core support now on my truck with both horns in the proper locations. The high note is mounted below the headlight to a nut welded to the core support. Don't let the location of the washer bottle throw you. It is in the original location. I believe it was relocated to the fender later in the 69 model year.