I can't tell the left from the right bracket by looking, they look identical on the car to me. The mounting screws are large chromed Philipps heads. Rear hole is about 1 and 3/4 inches from raised lip of roof. The downswept outer curve is literally about 1/8 inch from the sheetmetal lip on the rear side. Meaning, the chromed outer piece curves downward, and the bottom edge hovers about 1/8 inch off the sheetmetal. I'm not sure what you mean by "notch" on the brackets, they look identical to me from either side, on the car anyway. I think I may have another one in the garage, finding it will be another problem! :) Good luck, if I find it, I'll forward some info. Jerry in Virgina 6 Gremlins at the house now.