For those that need more details and instructions....
One pic I'm pointing at the bolt going through hole I drilled in the chrome bracket. Another pic shows how the bracket sits on top of the pannier mount not in front.
Some pointers in how I spotted the drilling point. I put masking tape on the metal in the general area of the location, then I mounted it with the one hole that is usable. I positioned the bracket and used a pen through the back side of the fender to mark the hole location onto the tape. Removed the bracket. I then centered an awl in the drawn hole and dimpled a pilot divot to keep my drill bit from walking. Peeled the tape. Clamped the bracket to a table. Then Using a dewalt corded hand drill and a hard metal 3/8" drill bit, I Positioned my bit on the pilot divot and going slow, I drilled a perfect hole. The metal remaining below the hole and the edge of the bracket is narrow, about 1/4" to 1/8".
To do the other bracket I put tape on the out side and mirrored the hole using the first bracket.