<Update>
It finally got warm enough to get my fender back on, and I discovered a little wrinkle.
There was originally a tab tacked onto the body just below the hinge. I thought it was unused, and since it was right where I wanted to put my bolt hole, I snipped it off...
Well, it turned out that tab was one of the ones used to mount the fender. Without it, there is a bit more play in the fender. Not a lot, but a little.
So the way I figure it, there are three courses of action.
(1) You could reposition that bottom hole to work around that tab. I'm sure it could be done, but to see exactly how and where, I'd have to tear it all back apart. And sorry guys, I'm just not that interested...
(2) You could make up a new tab that mounted under that bolt head. Just a small piece of light-gauge sheet, bent into an "L", with a hole in each leg.
(3) You could ignore the whole thing, because your rig is already rusting to pieces in the driveway, and a little play in the fender really won't be noticed.
I chose number three.
But I thought I'd mentioned it, so anybody that might try my fix can decide for themselves, and adjust accordingly...
Robert