There were none
I purchased the split dual tone horn as I didn't have room for the standard one. Compressor fit under my seat (keep in mind it must sit vertical) and the horn up front. I also bought the wiring harness which made installation a breeze which I highly recommend for the extra $ if you're not electrically inclined. This thing is loud and well built. Worth every penny and instructions are simple & clear. Ordering was a breeze and it was shipped right away.
Just installed this on my Triumph Tiger XR and got a chance to use it the same day. Sure made the other driver notice me and stop from pulling out into my lane. The single unit and after-market bracket would be an even easier choice for this bike, however, once we decided on a location the split unit was easy to install.