Unless originality is very important, you can get some horns from a later model car and use those. In my case, they are almost completely hidden, and functional was much more important than appearance. Not to mention much cheaper!!I got a pair of horns from a big Cadillac, my original hors either didn’t work,’or sounded like a sick goose when they did work. I picked the Cadillac horns because I wanted a horn that sounded with authority, something that says move!! You can either cut off the original mounting tabs, and weld on the Olds bracket, or drill out the spot welds and transfer the entire bracket and fill in the spot weld you drilled out. Most late model horns use a sealed connector that won’t corrode, and will require a separate ground wire.