Horn button and horn trim compatibility, need some help

The horn part you posted looks like the center twist on/off type to me, but I don't know about the button.
There were a few different designs, so if you can find a pic of the back of the button you want I could probably tell you.
Or at least describe what does what and goes where so you have more info.

Ok I found one but they look completely different.
The 67 has the twist on cap in the center and the 68-69 is flat and plastic like it pushes into an indent in the center of the wheel.