If you are thinking of fitting a Stebel Nautilus air-horn, the way it mounts means that the bracket has to be substantial to avoid it vibrating and seriously wobbling about.
If you intend to remove the OE horn and mount the Nautilus in the same position it hangs from a single stud (OE horn mount) and has to be supported by the single Nautilus fixing that is on the side. It is the only draw-back to fitting this horn to a GS. No doubt it wouldn't be a problem under the bonnet of a car.
The first photo is mine fitted. If you look to the top right of the picture you can see the bolt on the side of the horn. The bracket is angled so that the horn hangs centrally to avoid being clouted by the forks on full lock and inclined forward slightly to make sure that it doesn't foul the front suspension on full compression.
If you intend to remove the OE horn and mount the Nautilus in the same position it hangs from a single stud (OE horn mount) and has to be supported by the single Nautilus fixing that is on the side. It is the only draw-back to fitting this horn to a GS. No doubt it wouldn't be a problem under the bonnet of a car.
The first photo is mine fitted. If you look to the top right of the picture you can see the bolt on the side of the horn. The bracket is angled so that the horn hangs centrally to avoid being clouted by the forks on full lock and inclined forward slightly to make sure that it doesn't foul the front suspension on full compression.