I had a Stebel horn for a few years, but the compressor gave up. For a while I just reinstalled the stock horn, but it was so whimpy that I decided to replace it with a louder one.
I went to Auto Zone and bought a Blazer horn. I already had the relay from the Stebel horn, so all I had to do was mount the horn and connect the wires.
Here are a few photos of the horn installation.