I have converted new repro 67-68 fenders from standard to RS with these brackets. It was a quick and simple task. I did not havve access to a welder at the time and I used a couple of large heavy duty rivets on each side and they worked perfectly when I was done and I never experienced any problems the entire time I owned the car.
On the lighter side, my old college professor used to say, there is no such thing as a stupid question, just stupid people. Not many people asked questions in his class after that.