The mounting adapter bracket that bolts normally to the spindle and connects/bolts to the caliper one of two ways with two bolts/studs, perpendicular, or parallel to the rotor, ie radially, the later allows additionally, small adjustment of tuning the caliper operating radius. A pic is worth a thousand words, the pic in this thread unfortunately is not overly clear, hence my original question. As mentioned, radial mount is the current preferred method.