Yes I know.. but it is the usage of that plate that allows things like welded in strut tower bars (Which is illegal) as long as they connect to a plate that wraps around the strut tower. When alot of the desings you can tell that it has nothing to do with the design of the cage just an extension of the plate rule allowing a rear strut bar.
/Rant
But anyways.. Bad to Ed's question about Cams.