Would somebody please post a picture of rear fenders and brackets for a '11 - '14 roadster or / and delivery? Where do the brackets mount on the frame. I can't see any appropriate holes in original pictures and the subject is 200 miles away.
1911 has butterfly irons which are an extension of with the rear body mount. 1912 has a single bracket which comes off the bottom of the body mount and 1913-14 have swept back brackets that mount to the side of the rear deck of the body. So none of them actually bolt directly to the frame with the exception of the 1911, which is part of the rear body mount. Hope this helps.
Forgot. delivery brackets mount to the inside of the body as well.
If it is roadster rear fender brackets you are asking about, I believe they use the 3 rear body mount bolt holes.
Well that explains why I couldn't see specific holes in the frame.
Here is better info: