Got a pair from Morad - $100 to my door.
They let me in on "the secret," believe it or not, the two door brackets and 4 door brackets are exactly the same length.
The holes are not in the same place so you will have to do some mods, but I'm guessing if your brackets are shot, the mounting studs probably are also.
The guys at Morad are really great, have ordered several things from them with no issues.
Hope this help and good luck.