Single mounting bracket

I’ve been looking for the write up for single mounting brackets and can’t seem to find it. If you have a link can you please post it thank you. On the other hand I have seen the single brackets over on realtrainshorns.net those look pretty simple to use. Anyone have anything like that or may know where to get them at?

Did you mean this?
https://www.trainhornforums.com/showthread.php?t=5734

Yes that’s what I was looking for thank you. They have those single mounts to but 200 dollars for those seems a little over priced. Any body know where to get them at for Cheeper or have a set laying around. I’m just trying to look at my options.