Ok here is my question. This is for my buddy because I don't know the answer. He has a 1970 dart swinger /6 with drum brakes. He just acquired a 1972 dart K frame and disc brakes for a V8. But he did not get the upper control arms. I thought he needed those as well for the disc brake spindles. I hope I am wrong but isn't the 72 disc brakes upper control arm different than the 70 /6 control arms?