All GM Delco Remy seashell design horn elements were virtually identical as far as fitting the mounts on your firewall so...
don't limit your horn search to truck horns only.
Buick, Pontiac & Cadillac were just a few of the models in the era that used those seashell horns also.
It has been my experience that the Cadillac horns have a unique deep sounding tone to them.
