Koly,
All brackets need to be fabbed up. Unless you happen to have a Hannibal rack. I think they fit that only. Im planning to fashion some type of L bracket that will connect to the underside of my rack, either Baja or FrontRunner. Long part of L under rack short part vertical on side. Then awning attaches to that part. In my head this is how it works. Ive seen a couple that have looked similar. Should be a pretty painless and inexpensive set up for any rack.