I have a vintage Kohler cast iron sink that I want to mount outside to use as a beverage station. It has legs and bolting points on the back (see picture). I am hoping to bolt it directly to the brick exterior of my home. The contractor can't quite figure out the best way to do this. It appears that it has brackets along the top back that can slide/sit in a wall mount but I don't have those wall mounts. Any thoughts?
Buy some wall mounts. You should be able to find new or used (Salvage yard, Ebay, Hardware store) mounts that will work. Most are just an angled piece of cast iron or steel that the sink hangs on. Since your sink has legs most of the weight will be on the legs and the wall brackets will keep it from falling forward.