I attached the fenders to the car, along with the braces, the headlight bar, and the welting between the fenders and the splash shields. There were a lot of bolts to install, and a lot of fiddling and adjustments.
I decided not to use one of the original fender braces, because the place where the headlight bar attaches had some badly-repaired rust damage. I had a spare brace, which I sandblasted and painted. I also made some measurements of the braces, and did some careful bending to get them to match each other.
The next step is to install and hook up the headlights and the horn, and attach the hood latches. Then the car will be fully road-worthy.